if you drop your textbook it falls because the earth pulls it downward. at the same time, your textbook pulls on the earth with a force that is group of answer choices zero. equal to the downward pull on the textbook and in the same direction. immeasurably small. equal to the downward pull on the textbook but in the opposite direction.

Answer:

97 percent of Earth's water is freshwater from the ocean.

Explanation:

this is false

The time period is 2.73 s, amplitude  is 0.3 m,  speed is 0.69 m/s, magnitude of acceleration is 1.58 m/s2.

What is amplitude ?

The greatest displacement or distance that a point on a wave or vibrating body can travel in relation to its equilibrium position.

What is speed?

The pace and direction of an object's movement as it moves down a path are referred to as its velocity, as opposed to its speed. Alternatively put, speed is a scalar quantity while velocity is a vector.

let given that

The linear speed is(v) = 0.69 m/s

The radius (r) = 0.30m

a) The time period is(T) =circumference /v = 2πr/v = 2.73 s

b)The amplitude (A) = vT/2π= 0.3 m

c)The maximum speed is vmax= Aw = 2πA/t

= 0.69 m/s

d)The maximum magnitude of acceleration is

(amax)=  Aw²= A (2π/T)²=  1.58 m/s2

Therefore, the time period is 2.73 s, amplitude  is 0.3 m,  speed is 0.69 m/s, magnitude of acceleration is 1.58 m/s2.

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Answer:

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Explanation:

The torque applied will be the average of the 3 torque calculated.

Torque = 12.01 Nm

Torque of a couple is the product of a force and its perpendicular distance to the direction of the force. Torque is synonymous to moment.

From the question, the given radius is 0.53m. The perpendicular distance for each torque will be 2 x 0.53 = 1.06 m

We will calculate for each torque

T1 = F1d

T1 = 8 x 1.06 = 8.48 Nm

T2 = F2d

T2 = 15 x 1.06 = 15.9 Nm

T3 = F3d

T3 = 11 x 1.06 = 11.66 Nm

The torque applied will be the average of the 3 torque calculated. That is,

Torque = (8.48 + 15.9 + 11.66)/3

Torque = 36.04 /3

Torque = 12.01 Nm

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The MA, VR and efficiency of the screw nail will be 20, 176 and 11.36%, respectively.

Mechanical advantage (MR) is the ratio between the load and effort.

Velocity ratio (VR) of a simple machine is the ratio of distance travelled by effort to the distance travelled by the load in the machine.

The efficiency of a simple machine can be defined as the ratio of useful work done by the machine (output work) to the total work put into the machine (input work).

We need to make 14 cm of diameter of the screw. Then, we can solve the problem.

Suppose the effort applied on screw is (E) = x

Then, The force is (F) = 20x

MA = F/E

MA = 20x/x (x and x are cancelled)

MA = 20

Then,

VR = 2πR/ p

VR = 2×22×0.14/7×0.05

VR = 176

and

efficiency = MA/VR × 100

efficiency = 20/176 × 100 = 11.36

Therefore, the efficiency is 11.36.

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The acceleration of the sprinter is approximately 131,426 km/h^2.

To find the acceleration in km/h^2, we need to convert the units from meters per second (m/s) to kilometers per hour (km/h) and adjust the time units accordingly. Here's the step-by-step calculation:

1. Convert the final velocity from m/s to km/h:

  14 m/s * (3.6 km/h) / (1 m/s) = 50.4 km/h

2. Convert the time from seconds (s) to hours (h):

  1.38 s * (1 h) / (3600 s) = 0.0003833 h

3. Calculate the acceleration using the formula:

  Acceleration = (Final velocity - Initial velocity) / Time

Since the initial velocity is 0 m/s (rest), we have:

Acceleration = (50.4 km/h - 0 km/h) / 0.0003833 h

Acceleration = 131425.955 km/h^2

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We are given two points on the distance-time graph: (1, 40) and (3,130)

This means that:

At time 1 hour, the distance traveled was 40 km

At time 3 hours, the distance traveled was 130 km

We want to find the average speed during this 2 hour interval (from 1 hour to 3 hours).

Average speed is defined as:

Average Speed = Change in Distance / Change in Time

The change in distance is the distance traveled from 1 hour to 3 hours, which is 130 km - 40 km = 90 km

The change in time is 3 hours - 1 hour = 2 hours

Average Speed = 90 km / 2 hours

= 45 km/hr

Therefore, the average speed during this interval of time is 45 km/hr.

Answer:

a)  t = 2 10⁻² s ,  t = 2.4 10-1 s

Explanation:

In this exercise they indicate the delay in two signals

a) A signal travels on an electrical cable, between New York and London.

The wave formed in this wire for the signal. This wave travels at the speed of light, c = 3 108 m / s, so the delay is very small

                t = d / c

               t = 6000 10³/3 10⁸

               t = 2 10⁻² s

b) The signal points to a satellite in geostationary orbit

                   distance traveled = √ (2 36000 10³)² + 6000²

                  distance = 72 10⁶ m

the waiting time is

                t = d / c

                t = 72 10⁶/3 10⁸

               t = 2.4 10-1 s

    we can see that the signal sent by the satellites has more delay because its distance is much greater

A rock weighing 1 kilogramme is thrown from a distance of six metres.  height is the difference between the rock's kinetic and potential energy?

People have figured out how to transform energy from one type to another and use it to accomplish tasks, making modern civilization possible.

In a wide range of disciplines, including physics and the social sciences, the phrase is used to denote objects that are capable of changing

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Answer:   the acceleration of the masses is given by = 0, which means the angular acceleration of the pulley is zero. This implies that the masses m and 2m move with constant velocity,  they are in equilibrium.

Answer:

According that theory protons and neutrons have a strong force charge. ... Electrons are not affected by the nuclear strong force. Without a source for this additional energy the neutron cannot decay. Hence the neutron in a deuteron is stable.

The addition of electrons to the hadrons would allow for a 'stable and electrically neutral' environment due to electromagnetic attraction between electrons and protons and nuclear attraction between neutrons and protons.

To find reason, we need to know about electromagnetic force and nuclear force.

Thus, we can conclude that the addition of electrons to the hadrons would allow for a 'stable and electrically neutral' environment due to electromagnetic attraction between electrons and protons and nuclear attraction between neutrons and protons.

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Answer:

False

Explanation:

The amount of energy transferred between objects not only depend on their masses, initial and final temperatures but also on their specific heat capacity.

The specific heat capacity plays an important role in ascertaining the amount of thermal energy a body can conduct.

The equation;

              H = m c Ф

where H is the amount of heat

           m is the mass

            c is the specific heat capacity

            Ф is the change in temperature;

  is used to find the amount of heat of a substance.

Answer:

false

Explanation:

Because the  amount of energy is transferred between objects not only depend on their masses, initial and final temperatures but also on their specific heat capacity.

Hopes this helps you and it’s correct because I had this question on edgenuity

The strength of the electric force between particles depends on two factors: the magnitude of the charges on the particles and the distance between them. Increasing the magnitude of the charges and decreasing the distance between the particles will have a significant impact on the strength of the electric force.

Firstly, increasing the magnitude of the charges on the particles will result in a stronger electric force. According to Coulomb's law, the electric force between two charged particles is directly proportional to the product of their charges. So, if the charges on both particles are increased, the force between them will increase proportionally. This is because larger charges generate a stronger electric field, leading to a greater force of attraction or repulsion between the particles.

Secondly, decreasing the distance between the particles will also strengthen the electric force. Coulomb's law states that the electric force is inversely proportional to the square of the distance between the charges. As the distance between the particles decreases, the force between them increases exponentially. This is because the electric field becomes more concentrated, resulting in a higher force of attraction or repulsion between the charges.

In summary, increasing the magnitude of the charges on particles and decreasing the distance between them will both contribute to a stronger electric force. These factors have a multiplicative effect on the force, as the force is directly proportional to the product of the charges and inversely proportional to the square of the distance. By manipulating these variables, the strength of the electric force can be significantly altered, impacting the interactions between charged particles.

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Because Newton as Pressure = Thrust/Area, the answer will be 7.5.

The rotating equivalent of Newton's first law is this. When each child's weight exerts an equal amount of torque about the pivot in opposing directions, two kids can balance on a seesaw (clockwise and counter clockwise).

The idea of the seesaw You are probably aware that any two people, regardless of their weights, can balance each other while seated on opposite sides of a seesaw. All that is required is for each individual to contribute an equal moment, which is determined by multiplying the person's weight by the distance from the fulcrum.

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The volume of the parallelepiped is 83 cubic units.

The volume of a parallelepiped with sides give as a = ( 7,2 ,4 ) , b = ( 4,7 ,6 ) and c = ( 3,4 ,7 ).

The volume of a parallelepiped with adjacent sides a, b, and c is given by the scalar triple product (a × b) · c.

First, need to calculate the cross product of vectors a and b

a × b =

\(\left[\begin{array}{ccc}i &j&k\\7&2&4\\4&7&6\end{array}\right]\)

= (2 × 6 - 4 × 7) i - (7 × 6 - 4 × 4) j + (7 × 7 - 2 × 4) k

= -8 i - 26 j + 45 k

Now, calculate the scalar triple product

(a × b) · c = (-8)(3) + (-26)(4) + (45)(7) = 83

Therefore, the volume of the parallelepiped is 83 cubic units.

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The velocity of the ball just before it hits the ground is 14.0 m/s

Let's solve the problem using the given equation:

\(v^2 = u^2 + 2as\)

We know that u (initial velocity) is zero, s (distance traveled) is 10 meters, and a (acceleration due to gravity) is 9.81 m/s^2. We want to find the final velocity (v) just before the ball hits the ground.

Plugging in the given values, we get:

v^2 = 0 + 2(9.81)(10)

v^2 = 196.2

Taking the square root of both sides, we get:

v = sqrt(196.2)

v = 14.0 m/s

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--The complete Question is, A ball is dropped from a height of 10 meters. What is its velocity just before it hits the ground, assuming no air resistance? (Assume that the acceleration due to gravity is 9.81 m/s^2)

Hint: You can use the equation v^2 = u^2 + 2as, where v is the final velocity, u is the initial velocity (which is zero in this case), a is the acceleration due to gravity, and s is the distance traveled.--

The speed (in cm/s) of the electron, given that it travels 2.68 m in 6.11×10⁻⁸ s is 4.39×10⁵ cm/s

We'll begin by defining speed. This is given below.

Speed is defined as the distance travelled per unit.

Speed = distance / time

With the above formula, we can obtain the speed of the electron. Details below

The following data were obtained from the question give above:

Speed = distance / time

Speed = 0.0268 cm / 6.11×10⁻⁸ s

Speed = 4.39×10⁵ cm/s

Therefore, the speed is 4.39×10⁵ cm/s

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Answer:

The change in kinetic energy is twice the change in momentum

Explanation:

The momentum of an object is given by:

where

m is the mass of the object

v is its velocity

While the kinetic energy is given by

We want to check how these two quantities change when the speed of the object doubles, therefore when the new velocity is

For the momentum, we have

So, the momentum doubles.

For the kinetic energy, we have

So, the kinetic energy quadruples.

Therefore, the change in kinetic energy is twice the change in momentum.

Given,

The mass of the balls, m₁=5 kg and m₂=20 kg

The height of the cliff, h=80 m

As the balls are dropped and not thrown, their initial velocity is u=0 m/s

The acceleration due to gravity, g=10 m/s/s

The time it takes for an object to fall to the ground from a certain height does not depend on its mass. It only depends on the height from which it is dropped, the initial velocity with which it is thrown and the acceleration due to gravity.

As both balls are dropped from the same height, they both take the same amount of time to reach the ground.

From the equation of motion,

Where t is the time it takes to the balls to reach the ground.

On substituting the known values,

Thus both balls take 4 s to hit the ground.

Answer:

the air is being stopped in the pocket of the parachutes theys why the parachute has a certain shape so that the air that gets caught inside of it as the skydiver goes down slows down the landing

Answer:

It should just be A

Explanation:

I dont see the difference between these 2 but ill choose A and update you

Answer:

A: racket, air

Explanation:

Height to which the lift of the pail is taken is 0.37m.

Height is the vertical distance of an object from the surface of the Earth.

Work done = 13 J

Weight of the pail of the water = 35-N

Gravity is defined as the force that attracts a body to the Earth or any other physical body that has mass.

W = mgh

mg = 13 J

W = 35 N

h = \(\frac{W}{mg}\)

h = \(\frac{13}{35}\)

h = 0.37 m

The height to which the lift of pail will be raised will be 0.37m.

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1,401.88 N is the required weight of the man using the given conversion factor.

To calculate the weight of a typical NFL lineman in Newtons, we need to first convert the weight from pounds to kilograms using the conversion factor of 1 kg = 2.2 pounds:

314 pounds ÷ 2.2 pounds/kg = 142.73 kg

Next, we can use the formula Weight (newtons) = mass * gravity, where gravity is approximately 9.81 m/s^2 (meters per second squared):

Weight (newtons) = 142.73 kg * 9.81 m/s^2 = 1,401.88 N

The required weight in Newton of the man is 1,401.88 N

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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.

Answer:

Pulley = Flag Pole

Screw = Side latch

Wedge = Scissors

Wheel and axle = Car

The resistance indicated by the platinum thermometer at 200°C is 1.648 times the reference resistance Ro at 0°C.

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Friction

Change in motion

Deformation

What is Force?

Force is an influence that can cause an object to accelerate or deform. It is a vector quantity that has both magnitude and direction, measured in units of newtons (N). Force can result from the interaction between two physical bodies, such as when two objects collide or when a force is applied to an object.

Change in motion: Forces can cause an object to start moving, stop moving, change direction, or change speed.

Deformation: Forces can deform or change the shape of an object. For example, a force can stretch a spring, bend a wire, or compress a sponge.

Stress: Forces can create stress within an object, which is the internal force that resists deformation or change in shape. Too much stress can cause an object to break or fail.

Friction: Forces can cause friction, which is the force that resists the motion of two surfaces in contact. Friction can cause objects to slow down, stop moving, or prevent them from sliding.

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The water rocket is launched with an initial velocity of 10 m/s at an angle of 30° and reaches a height of 3.75m.

From the given,

the velocity of rocket = 10 m/s

angle = 30°

The distance/ height traveled by the rocket=?

H = u²sinθ² / 2g

u is the initial velocity of the rocket

g is the acceleration due to gravity = 10 m/s²

H = (10)²sin²(60°)/(2×10)

  = (100 ×3/4)×(1/20)

  =3.75 m

Thus the rocket covers a distance of 3.75 m.

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The diameter of a copper conductor is equal to 21.30 meters.

Given the following data:

To calculate the diameter of a copper conductor:

First of all, we would determine the resistance of the copper conductor by using the formula:

\(Resistance = \frac{Voltage }{Current} \\\\Resistance =\frac{8}{500}\)

Resistance = 0.016 Ohms

Next, we would determine the area of the copper conductor:

\(Resistance = \frac{\rho l}{Area} \\\\Area = \frac{\rho l}{Resistance}\\\\Area = \frac{0.019 \times 300}{0.016}\)

Area = 356.25 \(m^2\)

For the diameter:

From the area of a circle, diameter is given by the formula:

\(Area = \frac{\pi d^2}{4} \\\\d=\sqrt{\frac{4A}{\pi} } \\\\d=\sqrt{\frac{4 \times 356.25}{3.142} }\\\\d=\sqrt{453.53}\)

Diameter, d = 21.30 meters

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