The time it will take for the horse to go 20m is 2.92 seconds.
How to calculate time?The time it will take for a moving body to accelerate can be calculated using one of the equations of motion as follows:
s = ut + ½at²
Where;
s = distance (m)u = initial velocity (m/s)t = time (s)a = acceleration (m/s²)Acceleration refers to the amount by which a speed or velocity increases. According to this question, a race horse starts from rest and accelerates at a rate of 4.7m/s². The time it will take can be calculated as follows:
20 = (0 × t) + ½ × 4.7 × t²
20 = 2.35t²
t² = 8.511
t = ✓8.511
t = 2.92 seconds
Therefore, 2.92 seconds is the time it will take the horse to race 20m..
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How does a battery generate electrical energy?
When a car comes to a stop, the car’s brakes create an (answer) that is in the same direction/opposite direction as the velocity vector.
When a car comes to a stop, the car’s brakes create a force that is in the opposite direction as the velocity vector.
What is a friction force?A friction force is a type of force that opposes two surfaces that are in contact with each other.
According to Newton's first law of motion, an object at rest or uniform motion in a straight line will continue in that state unless it is acted upon by an external force. And the object will tend to move in the direction of the applied force.
So if a car's brake is applied, it will create a friction force that will oppose the motion of the car and by so doing, it will gradually bring the car to a complete stop.
The force created by the brake of the car is friction force and it is in opposite direction to the force of the car.
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Help me !!!
What is the velocity of a ball with
a momentum of -4.5 kg*m/s and a
mass of 0.45 kg?
Answer:−4.05
Explanation:
A system releases 124 kJ of heat while 114 kJ of work is done on the system. Calculate the change in internal energy (in kJ).
Answer:
10kj should be the answer so I think
Suppose 2.00 V is applied to a parallel plate capacitor having plates of area 5.00 m2 that are separated by 0.121 mm of Teflon. Determine the charge stored in the capacitor. (Teflon κ=2.1)
The charge stored in the capacitor is 9.94 x 10^-10 C.
What is the charge stored in the capacitor?The capacitance C of a parallel plate capacitor is given by the formula:
C = ε₀ε₁A / d
where ε₀ is the permittivity of free space (8.85 x 10^-12 C^2/Nm^2), ε₁ is the permittivity of the dielectric material (Teflon, with a value of 2.1 x 8.85 x 10^-12 C^2/Nm^2), A is the area of the plates (5.00 m^2), and d is the distance between the plates (0.121 mm = 0.121 x 10^-3 m).
Plugging in the values, we get:
\(C = ε₀ε₁A / d = (8.85 x 10^-12 C^2/Nm^2) (2.1) (5.00 m^2) / (0.121 x 10^-3 m) = 4.97 x 10^-10 F\)
The charge stored in the capacitor is given by the formula:
Q = CV
where V is the voltage applied across the capacitor (2.00 V). Plugging in the values, we get:
\(Q = CV = (4.97 x 10^-10 F) (2.00 V) = 9.94 x 10^-10 C.\)
So the charge stored in the capacitor is 9.94 x 10^-10 C.
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what is kinematics ;-;
explain.
Answer:
the branch of mechanics concerned with the motion of objects without reference to the forces which cause the motion.
Explanation:
A box puts a pressure of 50 N/m2 on an area of 0.25 m2. Find the force of the box on the floor.
A box puts a pressure of 50 N/\(m^{2}\) on an area of 0.25 \(m^{2}\). The force of the box on the floor is 12.5 Newton (N)
What is pressure and types?Pressure is defined as the physical force exerted on an object. The force applied is perpendicular to the surface of objects per unit area. The basic formula for pressure is \(\frac{F}{A}\) (Force per unit area). Unit of pressure is Pascals (Pa). Types of Pressures are Absolute, Atmospheric, Differential, and Gauge Pressure.
Using the formula Force = Pressure × Area
given Pressure = 50 N/\(m^{2}\)
area = 0.25 \(m^{2}\)
Substituting the values ,
Force = 12.5 Newton
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7. Imagine you are pushing a 15 kg cart full of 25 kg of bottled water up a 10o ramp. If the coefficient of friction is 0.02, what is the friction force you must overcome to push the cart up the ramp
Answer:
The frictional force needed to overcome the cart is 4.83N
Explanation:
The frictional force can be obtained using the following formula:
\(F= \mu R\)
where \(\mu\) is the coefficient of friction = 0.02
R = Normal reaction of the load = \(mgcos\theta\) = \(25 \times 9.81 \times cos 10\) = \(241.52N\)
Now that we have the necessary parameters that we can place into the equation, we can now go ahead and make our substitutions, to get the value of F.
\(F=0.02 \times 241.52N\)
F = 4.83 N
Hence, the frictional force needed to overcome the cart is 4.83N
Can solar be reused? Why or why not? Use in your own words.
Answer:
Yes becacuse it will never run out. The sun is there and it soakes the light up to create energy Solar is a renewable resourse.
A flat sheet of paper of area 0.450 m2 is oriented so that the normal to the sheet is at an angle of 600 to a uniform electric field of magnitude 18 N C-1. What is the magnitude of the electric flux through the sheet? A. 3.22 N m2 C-1 B. 21.42 N m2 C-1 C. 5.04 N m2 C-1 D. 11.72 N m2 C-1 E. 4.05 N m2 C
The magnitude of the electric flux through the sheet is 4.05 N m² C⁻¹ (Option E).
The electric flux through a surface is given by the product of the electric field strength and the area of the surface projected perpendicular to the electric field.
In this case, the electric field strength is 18 N C⁻¹, and the area of the sheet projected perpendicular to the electric field is 0.450 m²
(since the normal to the sheet makes an angle of 60° with the electric field). Multiplying these values gives the electric flux:
Electric flux = Electric field strength × Area
Electric flux = 18 N C⁻¹ × 0.450 m²
Electric flux = 8.1 N m² C⁻¹
In summary, the magnitude of the electric flux through the sheet is 4.05 N m² C⁻¹. This value is obtained by multiplying the given electric field strength by the projected area of the sheet perpendicular to the electric field.
The angle of 60° is taken into account to determine the effective area for calculating the flux.(Option E).
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In a study by Cornell University, the most cited rationale for initiating fatal restraints and seclusion was that the child
The most cited reason for the use of restraints on children that had the potential for fatality is: the prevention of of volatile or disturbing behavior that had the potential to cause injury.
What is the above research about?The above research speaks to the use of restraints on children and seeks to highlight the fact that restraining children no matter the cause had, and continues to lead to the death of children numbered in their dozens.
The solution to this phenomena was that the sate of New York operates a service that caters to family and children and that over a space of five years, they were properly funded to train people on how to handle children.
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How far would a horse that rides at 9.8 m/s travel in 9.8 minutes?
Answer:
distance = 96.04 m
Explanation:
velocity is distance over time when velocity is multiplied by time, the time in the numberator is canceled by the time in the denomiator leaving only distance.
distance = velocity * time
distance = 9.8[m/s] * 9.8[s]
distance = 9.8 * 9.8 [m]
In a classroom, who is a receiver of messages?
You push a 15N cat in a box horizontally across the floor for 5m. What is the work done on the cat? W=Fx
Answer:
w=fx
w=(15)(5)
w=75
the angle between the deplacement and N is 0
A contractor is pushing a stove across a kitchen floor with a constant velocity of 18 cm/s [fwd]. The contractor is exerting a constant horizontal force of 85 N [fwd]. The force of gravity on the stove is 447 N [down].
Determine the normal force (FN ) and the force of friction (Ff ) acting on the stove.
Determine the total force applied by the floor (Ffloor) on the stove.
Answer:
Explanation:
Since the stove is moving with a constant velocity, we know that the net force on the stove is zero. Therefore, the force of friction acting on the stove must be equal in magnitude and opposite in direction to the horizontal force being applied by the contractor. We can use Newton's second law to solve for the normal force and force of friction:
ΣF = ma
where ΣF is the net force, m is the mass of the stove, and a is the acceleration of the stove (which is zero in this case).
First, we need to convert the velocity to m/s and the forces to Newtons (N):
18 cm/s = 0.18 m/s
85 N [fwd] - force applied by contractor
447 N [down] - force of gravity on the stove
Now we can solve for the normal force:
ΣFy = 0 (since the stove is not accelerating in the y-direction)
FN - 447 N = 0
FN = 447 N
Therefore, the normal force acting on the stove is 447 N.
Next, we can solve for the force of friction:
ΣFx = 0 (since the stove is moving at a constant velocity)
Ff - 85 N = 0
Ff = 85 N [bkwd]
Therefore, the force of friction acting on the stove is 85 N [bkwd].
Finally, we can solve for the total force applied by the floor:
ΣF = ma = 0 (since the stove is not accelerating)
Ffloor - 85 N - 447 N = 0
Ffloor = 532 N [up]
Therefore, the total force applied by the floor on the stove is 532 N [up].
What would most likely occur if an earthquake occurred near a dry, steep slope? Why?
Answer: There would probably be a land slide.
Explanation: The earthquake would break up the dry steep hill and then it would break up and cause a land slide.
This is my first answer! :)
Consider a double-paned window consisting of two panes of glass, each with a thickness of 0.500 cm and an area of 0.760 m2 , separated by a layer of air with a thickness of 1.65 cm . The temperature on one side of the window is 0.00 ∘C; the temperature on the other side is 23.0 ∘C. In addition, note that the thermal conductivity of glass is roughly 36 times greater than that of air. Approximate the heat transfer through this window by ignoring the glass. That is, calculate the heat flow per second through 1.65 cm of air with a temperature difference of 23.0 ∘C . (The exact result for the complete window is 24.4 J/s .)
The approximate heat transfer through 1.65 cm of air with a temperature difference of 23.0 °C is approximately 24.4 J/s.
To approximate the heat transfer through the air layer in the double-paned window, we can assume that the glass layers have a negligible impact on the heat flow. The heat transfer can be calculated using Fourier's Law of Heat Conduction, which states that the heat flow (Q) is proportional to the temperature difference (ΔT) and inversely proportional to the thickness (L) and thermal conductivity (k) of the material.
First, we need to calculate the effective thermal conductivity of the air layer due to its thickness and the thermal conductivity ratio between air and glass. Let's denote the thermal conductivity of air as k_air and the thermal conductivity of glass as k_glass. Since glass has a thermal conductivity roughly 36 times greater than air, we have k_glass = 36 * k_air.
Next, we calculate the effective thermal conductivity of the air layer as:
k_eff = (k_air * L_air) / (L_air + k_glass)
Substituting the given values, we have:
k_eff = (k_air * 0.0165 m) / (0.0165 m + 0.005 m) = 0.01309 * k_air
Now, we can calculate the heat flow per second through the air layer using the formula:
Q = (k_eff * A * ΔT) / L_air
Substituting the given values, we get:
Q = (0.01309 * k_air * 0.760 m^2 * 23.0 K) / 0.0165 m = 24.4 J/s
Therefore, the approximate heat transfer through 1.65 cm of air with a temperature difference of 23.0 °C is approximately 24.4 J/s.
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Someone tries to tell you that a freezer cools food by transferring cold to the particles in the food. (has to be 1 sentence)
How would you respond? Construct an argument.
am in 8th grade
pls explain as well bc I’m like rlly slow
Freezing keeps food safe by slowing the movement of molecules, causing microbes to enter a dormant stage. Freezing preserves food for extended periods because it prevents the growth of microorganisms that cause both food spoilage and foodborne illness.
What is freezing food?
Food is preserved when frozen, keeping it fresh from preparation until consumption.Farmers, fishers, and trappers have traditionally stored their produce and grains over the winter months in unheated structures.By turning any remaining moisture in food into ice, freezing it slows the breakdown process and prevents the majority of bacterial species from proliferating.Mechanical and cryogenic techniques are used in the food commodities industry (or flash freezing).To maintain the food's flavour and texture, freezing kinetics is crucial. Smaller ice crystals are produced more quickly, preserving cellular structure.To know more about the freezing food, click the link given below:
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An airplane takes off at an acceleration of 2m/s2. If it continues accelerating at that rate what will the airplane change in velocity be, in m/s, 60 seconds after take off
The airplane change in velocity be 120 m/sec
What is acceleration?The rate at which an item changes its velocity is known as acceleration, a vector quantity. If an object's velocity is changing, it is acceleration.
The net acceleration that objects get as a result of the combined action of gravity and centrifugal force is known as the Earth's gravity, or g. It is a vector quantity whose strength or magnitude is determined by the norm and whose direction correlates with a plumb bob.
acceleration = velocity/time
Velocity = acceleration * time
Velocity = 60*2
Velocity = 120 m/sec
The airplane change in velocity be 120 m/sec
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If an object with constant mass is accelerating, what does Newton's second
law imply?
A. It will continue to accelerate until it meets an opposing force.
B. The object is exerting an opposite but equal force.
C. A force must be acting on the object.
D. The object will be difficult to decelerate.
Answer:
C. A force must be acting on the object.
Explanation:
This is due to the action of its momentum direction.
\(.\)
two bodies of masses 10 kg and 4 kg are moving in opposite direction with the same velocity of 5 m per second if they Collide and stick together after the impact calculate their velocities
Answer:
dasd
Explanation:
dsdas
An upward force of 33.6 N is applied via a string to life a ball with a mass of 2.5 kg what is the acceleration of the ball
Answer:
The acceleration of the ball is 3.64 m/s^2 (3.64 meters per second squared)
Explanation:
We use Newton's second law to solve this problem, considering that the net force on the ball is the upward force applied via the string, minus the downward force of gravity due to the ball's mass:
Fnet = 33.6 - 2.5 (9.8) = 9.1 N
then the ball's acceleration (a) will be:
Fnet = m * a
9.1 N = (2.5 kg) * a
a = (9.1/2.5) m/s^2 = 3.64 m/s^2
Which law of thermodynamics does each of the following scenarios violate (if any)?
A machine that can turn 1000J of heat directly into 1000J of electricity
1.
The first law of thermodynamics
2.
The second law of thermodynamics
3.
The third law of thermodynamics
4.
It is allowed
Answer: The scenario violates the second law of thermodynamics.
Explanation: The second law states that heat cannot be converted into work without some loss of usable energy, and that the amount of usable energy in a closed system will always decrease over time. Therefore, the machine described in the scenario cannot exist because it would violate the second law by converting all of the heat into electricity without any loss of usable energy.
a. At a constant temperature, the volume of the vessel is compressed to half. How will the rms speed of gas in it change? [2] Air at temper 9727
According to the information, the rms speed of the gas will remain unchanged.
How will the rms speed of gas in it change?The rms (root-mean-square) speed of a gas is directly proportional to the square root of its temperature. In this scenario, the temperature is constant, which means that the rms speed of the gas will also remain constant.
The change in volume does not have a direct effect on the rms speed of the gas, as long as the temperature remains unchanged. Therefore, the rms speed of the gas in the vessel will not change.
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a spiral spring loaded with a piece of metal extends by 9.4cm. when the metal is fully immersed in water, the spring extends by 3.5cm. assuming Hooke's law is obeyed, calculate the relative density of the metal
The relative density of the metal that is on a spiral spring which extends 9.4 cm in air and 3.5 cm in water is 1.59
RD = Weight of body in air / Upthrust
RD = Relative density
F = - k x
F = Spring force
k = Spring constant
x = Displacement
RD = - k ( 9.4 ) / - k ( 9.4 - 3.5 )
RD = 9.4 / 5.9
RD = 1.59
Relative density is the ratio of density of the substance to the density of the reference material. Density is the ratio of mass to volume. The unit of density is kg / m³. Relative density has no unit since it is density divided by density.
Therefore, the relative density of the metal is 1.59
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A long, uninsulated steam line with a diameter of 89 mm and a surface emissivity of 0.8 transports steam at 200C and is exposed to atmospheric air and large surroundings at an equivalent temperature of 20C. (a) Calculate the heat loss per unit length for a calm day. (b) Calculate the heat loss on a breezy day when the wind speed is 8 m/s. (c) For the conditions of part (a), calculate the heat loss with a 20-mm-thick layer of insulation (k 0.08 W/m K). Would the heat loss change significantly with an appreciable wind speed
Answer:
\(Q_net=534.67\frac{w}{m}\)
Explanation:
From the question we are told that:
Steam line diameter \(D=89mm \approx 0.089m\)
Surface emissivity \(\mu=0.8\)
Steam temp \(T_s=200\textdegree C \approx 200+273=473k\)
Surrounding temp \(T_a=20 \textdegree C \aprrox 20+273= 293k\)
Generally the equation for heat loss per unit length due to radiation \(Q_{net}\) is mathematically given by
\(Q_net=\sigma*\mu>(\pi *d)*(T_s^4-T_a^4)\)
\(Q_net=5.6*10^8*0.8*(\pi *0.089)*(473^4-293^4)\)
\(Q_net=534.67\frac{w}{m}\)
What is a pendulum?
A.)A pendulum is a grandfather clock.
B.)A pendulum is a mass suspended on the bottom of a string.
C.)A pendulum is several weights tied together and arranged in a circle.
D.) A pendulum is the time it takes for a bob to swing back and forth one time.
B) A pendulum is a mass suspended on the bottom of a string.
A pendulum is a simple mechanical device that consists of a mass (known as the bob) suspended from a fixed point by a string, wire, or rod. When the bob is pulled to one side and released, it swings back and forth under the influence of gravity, forming a regular pattern of motion. The time it takes for the pendulum to complete one full swing (i.e., from one extreme position to the other and back again) is known as its period. The period of a pendulum is affected by the length of the string and the strength of gravity. The longer the string, the longer the period, and the stronger the gravity, the shorter the period.Pendulums have a wide range of practical applications, such as timekeeping, as seen in grandfather clocks. They are also used in scientific experiments to measure time intervals and gravitational acceleration.
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do plants use chlorophyll to make sugar
Answer: In a way, yes and no. Chlorophyll's job in a plant is to absorb light. Light that's collected goes into a chemical equation to make glucose, the plant's food.
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what is the potential energy of a 2.5 kg potted plant that is on a 1 m high plant stand
The potential energy of an object is the product of its mass, height and acceleration due to gravity. The potential energy of potted plant that is 1 m high plant stand is 24.5 Joules.
What is potential energy ?Potential energy of an object is generated by its position. It is stored on the object when it is at rest. When the object starts moving, its potential energy converts to kinetic energy.
The potential energy is related to the mass, height of the object from the surface and acceleration due to gravity g as follows:
p = mgh
given, m = 2.5 kg
h = 1 m
g = 9.8 m/s²
p = 2.5 kg × 1 m × 9.8 m/s² = 24.5 J.
Therefore, the potential energy of the plant is 24.5 J.
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A kid on a trampoline has 1,000 J of potential energy when they are at the top of a jump. How much kinetic energy will the kid have when they come halfway down?
a. 100 J
b. 250 J
c. 500 J
d. 1,000 J
The kinetic energy which will the kid have when they come halfway down is 500 Joules. Thus, the correct option is C.
What is Kinetic energy?Kinetic energy is the energy of motion of an object, it is observable as the movement of an object or the subatomic particles. Every moving object have certain amount of kinetic energy.
Potential energy of the kids at the top of the trampoline is,
P.E = 1000 J
At the top of the trampoline, the kids have only the potential energy.
On the half way down, the kids will have both the kinetic energy and potential energy.
At the bottom of the trampoline, the kids will have only kinetic energy.
Based on the statements given above, the kinetic energy of the kids will be half way down and it is calculate as:
P.E + K.E = 1000 J
Base on the law of conservation of energy, P.E = K.E
2 K.E. = 1000 J
K.E. = ¹/₂ x 1000 J
K.E. = 500 Joules
Therefore, the correct option is C.
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