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2 years ago

A boy spins a top on a table. How can he INCREASE the total energy of this system?

Physics

1 answer:

babunello [35]2 years ago

8 0

He can increase the total energy of the system by spinning the top faster.

<h3>What is energy?</h3>

The term energy refers to the ability to do work. The total energy of the system refers to the gravitational potential energy and the rotational energy of the top.

Hence, he can increase the total energy of the system by spinning the top faster.

Learn more about energy:brainly.com/question/1932868

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A pitcher throws a softball toward home plate. When the ball hits the catcher’s mitt, its horizontal velocity is 32 meters/secon

n200080 [17]

To calculate the force of impact F, first lets calculate the acceleration a of the ball:

a=v/t where v is the velocity of the ball and t is time

a=32/0.8=40 m/s²

To get the force F we need the Newtons second law:

F=m*a where m is the mass of the ball and a is the acceleration.

F=m*a= 0.2*40 = 8 N

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3 years ago

How tall would a tower need to be if the period of a pendulum were 30. seconds

Virty [35]

We use the following expression

T = 2*pi *sqrt(l/g)

Where T is the period of the pendulum

l is the length of the pendulum

and g the acceleration of gravity

We solve for l

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The tower would need to be at least 223.413 m high

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3 years ago

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A police car chases a speeder along a straight road towards a cliff both vehicles move at 160km/h the siren on the police car pr

natta225 [31]

Answer:

f ’= 97.0 Hz

Explanation:

This is an exercise of the doppler effect use the frequency change due to the relative movement of the fort and the observer

in this case the source is the police cases that go to vs = 160 km / h

and the observer is vo = 120 km / h

the relationship of the doppler effect is

f ’= f₀ (v + v₀ / v- $v_{s}$ )

let's reduce the magnitude to the SI system

v_{s} = 160 km / h (1000 m / 1km) (1h / 3600s) = 44.44 m / s

v₀ = 120 km / h (1000m / 1km) (1h / 3600s) = 33.33 m / s

we substitute in the equation of the Doppler effect

f ‘= 100 (330+ 33.33 / 330-44.44)

f ’= 97.0 Hz

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3 years ago