9. Peter drove 57 miles down the coastline in 3 hours. What was his
average speed? (6.8C)
O 171 mi/h
O 50 mi/h
O .05 mi/h
O 19 mi/h
Answers
Related Questions
using question 13, the measured initial kinetic energy (j) of the bullet is: hint: 1 gram = 1/1000 kg
a.15870 b.1.5 c.1500 d.15.01 e.15000 f.150.0 g.5.0 h.1.50
Answers
The measured initial kinetic energy (J) of the bullet is 158.70 J.
So, the correct answer is A.
We know that the initial kinetic energy (KE) of the bullet is given by:
KE = (1/2) mv²
Where,m = mass of the bullet
v = velocity of the bullet
So, the initial kinetic energy of the bullet can be calculated as:
KE = (1/2) mv²
KE = (1/2) (m) (v)²
To determine the initial kinetic energy of the bullet in Joules, we can use the formula KE = 1/2mv², where m is the mass of the bullet and v is its velocity.
From question 13, we know that the mass of the bullet is 0.023 g, which is equal to 0.023/1000 kg. We also know that its velocity is 330 m/s.
Plugging these values into the formula, we get KE = 1/2 x 0.023/1000 x (330)²= 158.7 J.
Therefore, the measured initial kinetic energy of the bullet is option A, 158.70 J.
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When the energy of a wave increases, what happens to the amplitude?
Answers
Answer:
The energy transported by a wave is directly proportional to the square of the amplitude. So whatever change occurs in the amplitude, the square of that effect impacts the energy. This means that a doubling of the amplitude results in a quadrupling of the energy.
Explanation:
When the energy of a wave increases, the amplitude also increases. This is because the amplitude of the wave is directly proportional to the energy of a wave.
What is the amplitude of a wave?The amplitude of a wave may be defined as the maximum displacement or distance moved by a point on a vibrating body or wave measured from its equilibrium position. It is equal to one-half the length of the vibration path.
It is the principle of physics that when the amplitude of the wave is higher, the energy also gets higher. To summarise, waves carry energy. The amount of energy they carry is related to their frequency and their amplitude. The higher the frequency, the more energy, and the higher the amplitude, the more energy.
Therefore, when the energy of a wave increases, the amplitude also increases. This is because the amplitude of the wave is directly proportional to the energy of a wave.
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The _________ system permits the driver to turn the ignition switch to activate an electric motor, solenoid switch, wiring, and battery.
Answers
The starting system permits the driver to turn the ignition switch to activate an electric motor, solenoid switch, wiring, and battery.
In vehicles, the starting system is a fundamental part for the operation of the electrical system, its main function is to start the vehicle by providing it with the necessary electrical current through the ignition switch in which the key is inserted and must be turned to the on position.
What is electric current ?In physics the electric current is the magnitude that expresses the amount of electric charge or electric current in coulomb (c) that passes through an electrical conductor in a given time in seconds (s). Its unit of measurement in the international system is the Ampere (A).
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Find the force of attraction between a 60 kg student and:A. Another student of mass 80 kg, 1.4 m away.B. A 130,000 kg blue whale, 10 m away.C. The Great Pyramid in Egypt, with an estimated mass of 5.22 x 109 kg, 1.0 km away.D. A 45 g golf ball, 95 cm away.
Answers
According to Newton's Law of Universal Gravitation, the force between to bodies of masses m and M separated by a distance r is:
\(F=G\frac{Mm}{r^2}\)Where G is the gravitational constant:
\(G=6.67\times10^{-11}N\frac{m^2}{\operatorname{kg}^2}\)In all cases, use M=60kg, and replace the values of the second mass m and the distance r accordingly.
A) m=80kg, r=1.4m
\(\begin{gathered} F=(6.67\times10^{-11}N\frac{m^2}{\operatorname{kg}^2})\times\frac{(60\operatorname{kg})(80\operatorname{kg})}{(1.4m)^2} \\ =1.6\times10^{-7}N \end{gathered}\)B) m=130,000kg, r=10m
\(\begin{gathered} F=(6.67\times10^{-11}N\frac{m^2}{\operatorname{kg}^2})\times\frac{(60\operatorname{kg})(130,000\operatorname{kg})}{(10m)^2} \\ =5.2\times10^{-6}N \end{gathered}\)C) m=5.22*10^9kg, r=1000m
\(\begin{gathered} F=(6.67\times10^{-11}N\frac{m^2}{\operatorname{kg}^2})\times\frac{(60\operatorname{kg})(5.22\times10^9\operatorname{kg})}{(1000m)^2} \\ =2.1\times10^{-5}N \end{gathered}\)D) m=0.045kg, r=0.95m
\(\begin{gathered} F=(6.67\times10^{-11}N\frac{m^2}{\operatorname{kg}^2})\times\frac{(60\operatorname{kg})(0.045\operatorname{kg})}{(0.95m)^2} \\ =2.0\times10^{-10}N \end{gathered}\)MATCH THE FOLLOWING
COLUMN A
1. A material used for making electro magnets
2. A device which is essential in an electric bell
3. A material which does not allow electric current to pass
4.
A magnetic device used for finding geographic directions
5. A device which makes use of heating effect of electricity.
6. A device which makes use of magnetic effect of electricity.
COLUMN B
telephones
soft iron
water geyser
electromagnet
Plastic wire
Magnetic needle
Answers
Answer:
afrcrftftgyfygygygygygygyvyvuguvy5vyvycycy
shdhdggxshjwhwywsd dccefc
what is the momentum (in kg m/s) of a 106- kg football player running at a top speed of 9.5 m/s? tries 0/12 what is the momentum of a 9.42- g rifle bullet traveling at 678 m/s?
Answers
The momentum of the football player is 1,007 kg·m/s and the momentum of the rifle bullet is 6.39156 kg·m/s.
The momentum of a football player running at a top speed of 9.5 m/s and weighs 106 kg can be calculated using the formula:
p = mv
where
p is the momentum in kg m/s,
m is the mass in kg,
v is the velocity in m/s.
Substituting the values into the formula, we have:
p = 106 kg × 9.5 m/s
p = 1,007 kg·m/s
Therefore, the momentum of the football player is 1,007 kg·m/s.
The momentum of a rifle bullet traveling at 678 m/s and weighs 9.42 g can be calculated using the formula:
p = mv
Mass of rifle bullet, m = 9.42 g = 0.00942 kg
Velocity of rifle bullet, v = 678 m/s
Substituting the values into the formula, we have:
p = 0.00942 kg × 678 m
p = 6.39156 kg·m/s
Therefore, the momentum of the rifle bullet is 6.39156 kg·m/s.
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Carbon-12 and carbon-13 are two different___
of carbon.
Answers
Answer: isotopes
Explanation:
Anyone know the answer ——————————
Answers
A uniform plank of mass 10kg and length 10m rests on two supports, A and B as shown. A boy of weight 500N stands at a distance of 2m from A. Find the reaction forces U¹ and U² at the supports A and B respectively
Answers
Answer:
U² = 142.86 N
U¹ = 357.14 N
Explanation:
Taking summation of the moment about point A, we get the following equilibrium equation: (taking clockwise direction as positive)
\(W(2\ m) - U^2(7\ m) = 0\)
where,
W = weight of boy = 500 N
U² = reaction ay B = ?
Therefore,
\((500\ N)(2\ m)-(U^2)(7\ m)=0\\U^2=\frac{1000\ Nm}{7\ m}\\\)
U² = 142.86 N
Now, taking summation of forces on the plank. Taking upward direction as positive, for equilibrium position:
\(W-U^1-U^2=0\\500\ N - 142.86\ N = U^1\\\)
U¹ = 357.14 N
A 0.068-kg ball strikes a wall with a velocity of 22.1 m/s. the wall stops the ball in 0.63 s. what is the magnitude of the
force applied by the wall on the ball?
a. 5.3n
b. 4.2n
c. 12n
d. 2.4n
Answers
The wall's force exerted to the ball is measured at . 2.4n
The ideal answer is D.
What consequences does the wall's force having on the ball have?A ball will bounce back in the opposite direction after colliding with a wall. The ball's direction of motion is altered as a result of the wall's force.
How much force was actually exerted?The force's strength to effect the required change can be gauged by how large it is. Force has a magnitude and behaves in a specific direction. Force can involve physical contact or not. Almost all daily tasks include the use of force in one way or another.
The law of momentum is Ft = mv; so F = mv/t = 2.4 Newtons
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Which of the following statements about developing a personal fitness program is NOT true?
A When developing a personal fitness program, it is important to implement strategies that will help
maintain the program as well as give it a successful start
B. Personal factors such as age, health concerns, and likes are important to consider when developing
a personal fitness program
C. The starting skill level of the physical activities included in a personal fitness program should be
determined from other individuals' fitness programs
D. The FITT principle should be used when developing a personal fitness program,
Please select the best answer from the choices provided
A
B
Save and Exit
Next
Answers
Answer:
C
Explanation:
The starting skill level of the physical activities included in a personal fitness program should be determined from other individuals' fitness programs is a statement which is not true. Everyone starts their personal fitness journey at a different level which should be regarded . A fitness test should be taken to determine where an individual should start their new lifestyle.
Answer:
C. I got it right :)
Explanation:
What is the input distance for a claw hammer if the output distance is 2.0 cm and the mechanical advantage is 5.5?
Answers
Answer:
0.36cm
Explanation:
Given parameters:
Output distance = 2.0cm
M.A = 5.5
Unknown:
Input distance = ?
Solution:
The mechanical advantage is the value of the force multiplier.
M.A = Output distance / Input distance
Input distance = Output distance / mechanical advantage
Input distance = \(\frac{2.0cm}{5.5}\) = 0.36cm
what converts fluid pressure to mechanical motion?
Answers
Fluid pressure can be converted to mechanical motion by using hydraulic systems.
Hydraulic systems use liquids such as oil, water or a mixture of both to transfer power and control machinery. The fluid is pushed through a series of valves and cylinders that convert the pressure of the fluid into mechanical motion.Hydraulic systems work on the principle of Pascal's law, which states that the pressure applied to a fluid in a closed container will be transmitted equally in all directions. In a hydraulic system, when a force is applied to the fluid in a closed container, the pressure of the fluid increases, and the fluid is forced through the system.
This pressure is then used to create movement in a cylinder or piston. Hydraulic systems are used in a wide range of applications such as cranes, excavators, bulldozers, aircraft landing gear, brakes, and steering systems in cars, and many other mechanical systems. In conclusion, hydraulic systems convert fluid pressure to mechanical motion, and they are used in a wide range of applications due to their many advantages.
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How does an aerofoil create lift and why does the air above the wing flow faster than below.
Answers
Answer: hey!
youre answer is
In order to meet up at the trailing edge, the molecules going over the top of the wing must travel faster than the molecules moving under the wing. Because the upper flow is faster, then, from Bernoulli's equation, the pressure is lower. The difference in pressure across the airfoil produces the lift.
Airplane wings are shaped to make air move faster over the top of the wing. When air moves faster, the pressure of the air decreases. So the pressure on the top of the wing is less than the pressure on the bottom of the wing. The difference in pressure creates a force on the wing that lifts the wing up into the air.
Bernoulli's Principle, states that pressure decreases when air moves faster. Air moves faster over the top of a wing, which results in an area of lower pressure. Meanwhile, the bottom of the wing experiences higher pressure. Camber increases the difference in air pressure between the top and bottom surfaces.
Explanation:
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3 examples of newtrons 2 law
Answers
Explanation:
1) Kicking a ball.
2) Capture the ball by hand.
3) Push a car.
A typical consumer purchases a set of smart light bulbs. The set comes with a centralized connection device and basic instructions for installation. For most of these types of devices, what steps may be involved in configuring them?
Answers
In order to properly configure the smart light bulbs, buyers should read the installation and configuration manual before connecting or using them to avoid possible damage due to improper handling.
What is the user manual?The user manual is a tool that is usually included when we buy a product. This manual includes all the characteristics of the object that we have purchased and the recommendations and specifications for correct use and maintenance to prolong its useful life.
According to the above, what the common buyer should do to prevent their bulbs from being damaged and to be able to configure them properly is to read the user manual.
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the rating of a branch circuit is determined by its
Answers
The rating of a branch circuit is determined by its ampacity.
Ampacity is the maximum amount of electric current that a conductor or device can carry without overheating and damaging the insulation or conductors. The rating of a branch circuit is the maximum current that the circuit can safely carry without exceeding its capacity or causing damage.
This rating is typically determined by the size of the wire and the protective devices, such as fuses or circuit breakers, that are installed to prevent overloads and short circuits. Branch circuits are commonly used to power individual rooms or devices, such as outlets, lighting fixtures, and appliances. The ampacity of the branch circuit must be carefully calculated to ensure that it can handle the expected load and prevent the risk of electrical hazards.
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The rating of a branch circuit is determined by its design capacity to safely carry current expressed in terms of amperes. This prevents overheating or fire hazards. The total current flowing into a junction is equal to the total current flowing out, according to Kirchhoff's junction rule.
Explanation:The rating of a branch circuit is chiefly determined by the amount of current it's designed to safely carry without overheating or causing a fire. This value is typically found in terms of amperes (or amps), which represent the unit of electrical current. An electrical appliance's requirement for operating is usually expressed in amps. Circuit breakers and fuses are also rated in amps and are designed to interrupt the circuit if the current exceeds their rated value for a specific period.
For measuring the current flowing through a branch, we use an instrument called an ammeter. It needs to be placed in series with the branch circuit, and it has a small resistance to limit its effect on the circuit.
In applications of Kirchhoff's first rule (the junction rule), each branch's current is labelled, and the direction it's going must be determined. However, the total current or the sum of the electric current flowing into and out of the junction (or point in the circuit where conductors meet) must be equal, according to the junction rule.
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What is the head loss through this section of pipe (m), if the
friction factor is 0.018, the velocity is 3.0 m/s, and the
equivalent length of pipe and fittings is 650 m?
(A) 15 (B) 20 (C) 25 (D) 36
Answers
The calculated head loss is approximately 20 meters which is option B.
Friction factor (f) = 0.018
Length of pipe and fittings (L) = 650 m
Velocity (V) = 3.0 m/s
Acceleration due to gravity (g) = 9.81 m/s²
The head loss (hL) can be calculated using the Darcy-Weisbach equation:
hL = (f * L * V²) / (2 * g * D)
Assuming a diameter (D) of 1 meter, we can substitute the values into the equation:
hf= 0.018*650*9/2*3*1=17.85
Hence ,
We considered 20 as final answer which is B.
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If a car is traveling on a highway and arrives at its destination 56 miles away after 4 hours, what is its speed?
Answers
Answer:
14 miles per hour
Explanation:
You have to divide 56 miles by four hours to get 14 miles per hour
when the valve between the two tanks of water is opened, the temperature of the
water in each tank changes. what is the equilibrium temperature to the nearest
whole degree celsius
Answers
Answer:
To determine the equilibrium temperature, we need more information about the initial temperatures and volumes of water in each tank. Without this information, we cannot calculate the final temperature after opening the valve. Additionally, we would need to know the rate at which the water is flowing between the tanks, as this would also affect the final temperature.
About temperatureTemperature is a basic quantity in physics that expresses the hotness and coldness of an object. Simply put, the higher the temperature of an object, the hotter it is. The International (SI) unit used for temperature is the Kelvin (K).
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(a) once the turntable starts to rotate, what force causes the centripetal acceleration when the coin is stationary relative to the turntable? under what condition does the coin begin to move relative to the turntable? (
Answers
The force of static friction between the coin and the turntable, which exists when the coin and turntable are at rest with respect to each other, produces the centripetal acceleration.
Why does centripetal acceleration occur?Centripetal accelerations are brought on by centripetal forces. The gravitational pull between them produces the centripetal force that drives the motion in the unique situation of the Earth's circular motion around the Sun and any satellite's circular motion around any celestial body.
What is the coin's centripetal force?The coin keeps rolling around the funnel's sides in ever-tinier circles until it finally falls into the well's center hole. Centripetal force is being demonstrated by that coin.
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(PLESE HELP) why does boiling pot of water have more temperature that an iceberg
Answers
Can somebody pls pls help
Answers
Answer:
i cant see it
Explanation:
huh i cant see it
what is the difference between constant speed and acceleration? Explain mathematically
Answers
Answer:
A constant velocity of an object ensures that the rate of change of velocity with time is null, and hence, the acceleration of the object is zero. A constant acceleration of an object ensures that the velocity of the object is changing continuously with time, and the velocity will not be constant.
Explanation:
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Two men standing on the same side of wall and at the same distance from It, such that they are 4oom apart when one fires a gun the other hears the first report in 1.2s and the second in 0.5s after the first. calculate 1) Velocity of sound in air . 2)the perpendicular distance of the men from the wall.
Answers
Answer:
1. 571.43m/s
2. 142.9m and 342.9m
Explanation:
1.Take the difference in time.
1.2-0.7=0.7 seconds
Take the distance between them and divide with differnce in time.
400÷0.7=571.43 seconds.
2.Take the time of the two men and divide by two.
0.5÷2= 0.25 secs
1.2÷2= 0.6 secs
multiply each with the velocity.
0.25×571.43=142.9m
0.6×571.43=342.9m
Which of the following terms represents the debate between genetic and environmental influences on behavior?
A.
stability versus change
B.
continuity versus stages
C.
nature versus nurture
D.
general versus multiple
Answers
Answer:
I believe it is nature vs nurture
Explanation:
The term that represents the debate between genetic and environmental influences on behavior is nature versus nurture. Thus, the correct option for this question is C.
What do you mean by Genetic influences?Genetic influences may be defined as the types of concerns that significantly deal with the behavioral and psychological characteristics of an individual which include their intellectual ability, personality, and risk for mental illness with respect to their genetic sequences.
When you talk about the debate between genetic and environmental influences on behavior, the term nature reflects the environmental aspect of the debate while the term nurture reflects the genetic aspects of the debate.
Therefore, nature versus nurture is the term that represents the debate between genetic and environmental influences on behavior. Thus, the correct option for this question is C.
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Q3. Recall the equation that links gravitational field
strength, mass and weight
Answers
if a person can jump 2m in earth surface how high can he jump in the moon (g of moon = 1.66m/s, g of earth = 9.8 m/s) [hint: use w=mgh since work done and mass of a person is same everywhere
Answers
Answer:
\(h_{moon} = 11.8\ m\)
Explanation:
Since the work done is same everywhere in the universe. Hence, the work done in jumping will be same for the person on moon and earth:
\(W_{moon} = W_{earth}\\\\P.E_{moon} = P.E_{earth}\\\\mg_{moon}h_{moon} = mg_{earth}h_{earth}\\\\g_{moon}h_{moon} = g_{earth}h_{earth}\\\\(1.66\ m/s^2)h_{moon} = (9.8\ m/s^2)(2\ m)\\\\h_{moon} = \frac{(9.8\ m/s^2)(2\ m)}{1.66\ m/s^2}\\\\h_{moon} = 11.8\ m\)
What is transmission of sound?
Answers
Sound is transmitted through gases, plasma or blood, and liquids as longitudinal waves, also called compression waves. It requires a medium to propagate. Through solids, however, it can be transmitted as both longitudinal waves and transverse waves.
For example, when you flick the rim of a glass, the glass will vibrate imperceptibly. These vibrations move through the air and strike the ear drum of anyone within hearing range (click here to find out 'How Our Ears Hear'). In fact, these vibrations, or sound waves, can move through any medium: gas, liquid or solid.
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A relationship in which one variable decreases when another variable increases. *
Answers
Answer:
Direct variation suggests that two variables change in the same direction, when one variable decreases the other increases.