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bagirrra123 [75]
3 years ago
11

Which law of motion accounts for the following statement? "A ball hit by a man travels faster than one hit by a boy."

Physics
2 answers:
7nadin3 [17]3 years ago
6 0

Answer:

Newton's second law of motion accounts for the "A ball hit by a man travels faster than one hit by a boy."

Explanation:

Second law  of motion relates the force exerted by an object and the acceleration of that object, of a given mass.

Mathematically it is F = ma where F is the force, m is the mass and a is the acceleration of an object.

Hence according to that , for a given mass, it can be seen that force is directly proportional to the acceleration. More force implies more acceleration. Lesser force implies lesser acceleration and so moves slowly.

That's why when the same ball is hit by the father with a greater force, it travels faster than when hit by the child with a lesser force.  

kifflom [539]3 years ago
5 0

A ball hit by a man is stronger than a ball hit by a man because the man uses more force when hitting the ball than the boy does.

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5. You are skateboarding on top of a small hill and take a break. You have 100 J of potential energy. If
Sholpan [36]

Given the potential energy of 100 J, the height of the hill is 0.128 m (12.8 cm)

Explanation:

The gravitational potential energy of an object is given by:

U=mgh

where

m is the mass of the object

g is the acceleration of gravity

h is the heigth of the object, relative to the ground

In this problem, we have

U = 100 J is the potential energy of the person

g=9.8 m/s^2 is the acceleration of gravity

m = 80 kg is the mass of the person

Solving for h, we find at what height the person is:

h=\frac{U}{mg}=\frac{100}{(80)(9.8)}=0.128 m = 12.8 cm

Learn more about gravitational potential energy here:

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8 0
3 years ago
Since the density of air decreases with an increase in temperature, but the bulk modulus B is nearly independent of temperature,
Usimov [2.4K]

To develop this problem it is necessary to apply the concept related to the speed of sound waves in fluids.

By definition we know that the speed would be given by

v=\sqrt{\frac{\beta}{\rho}}

\beta = Bulk modulus

\rho =Density of air

From the expression shown above we can realize that the speed of sound is <em>inversely proportional</em> to the fluid in which it is found, in this case the air. When the density increases, the speed of sound decreases and vice versa.

According to the statement then, if the density of the air decreases due to an increase in temperature, we can conclude that the speed of sound increases when the temperature increases. <u>They are directly proportional.</u>

6 0
3 years ago
A flat metal washer is heated. As the washer's temperature increases, what happens to the hole in the center? A flat metal washe
jenyasd209 [6]

answer;

The hole in the center of the washer will expand

explanation;

<em>A flat metal washer is heated. As the washer's temperature increases, what happens to the hole in the center? A flat metal washer is heated. As the washer's temperature increases, what happens to the hole in the center? The hole in the center will remain the same size. Changes in the hole cannot be determined without know the composition of the metal. The hole in the center of the washer will expand. The hole in the center of the washer will contract.</em>

this is an example of area expansivity.

coefficient of area expansivity is change in area per area per degree rise in temperature

a=dA/(A*dt)

as the temperature rises , there will be volumetric and area expansivity on the body. volume also increases because of the intermolecular forces of attraction between the molecule is now getting apart.

7 0
3 years ago
A lecturer is demonstrating two-slit interference with sound waves. Two speakers are used, 1.9 m apart. The sound frequency is 1
Natasha2012 [34]

Answer:

\Delta y = 0.92 m

Explanation:

As we know that the speed of the sound in air is

v = 343 m/s

frequency of the sound is

f = 1220 Hz

now the wavelength is given as

\lambda = \frac{v}{f}

\lambda = \frac{343}{1220}

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now the position of minimum is given as

d sin\theta = \frac{\lambda}{2}

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\theta = 4.24 degree

now the position of minimum intensity is given as

y = L tan\theta

y = 6.2 tan4.24

y = 0.46 m

so the separation between the minimum intensity on either sides is given as

\Delta y = 2y

\Delta y = 2(0.46)

\Delta y = 0.92 m

6 0
3 years ago
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