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3 years ago

The force applied to a moving object was 100 N. The object moved 5 m. How much work was done on the object

Physics

1 answer:

Luden [163]3 years ago

4 0

Answer:

500J

................

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Kinetic energetic plus potential energy is called

densk [106]

Object mechanical energy

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3 years ago

How much taller does the Eifel Tower become at the end of a day when the temperature has increased by 10°C? Its original height

Licemer1 [7]

Answer:

Eifel Tower height will increase by 0.03888m

Explanation:

You can calculate the variation in height by using the coefficient of thermal expansion of the steel:

ΔH = H*α*ΔT

The coefficient of thermal expansion α is describes the change in length of an object after a change in temperature. the coefficient of thermal expansion of the steel depends on the composition of the steel, but in general, it has a value of around $12*10^{-6}oC^{-1}$ . Then, the variation in heigth will be equal to:

$ΔH = H*α*ΔT = 324m *12*10^{-6}oC^{-1}*10oC = 0.0388m$

6 0

4 years ago

A potter's wheel is rotating around a vertical axis through its center at a frequency of 2.0 rev/s. The wheel can be considered

mart [117]

Answer:

$\omega_f=12.2954 \,rad.s^{-1}$ i.e.

$Frequency=1.9569\,rev.s^{-1}$

Explanation:

Given:

angular speed, $\omega_i =2\times 2\pi \,rad.s^{-1}$

mass of the disk, $M=4.9\,kg$

radius of the disk, $R=0.2\,m$

mass of the chunk, $m=2.7\,kg$

radius of the chunk, $r=0.04\,m$

We know that the angular momentum is given by:

$L=I.\omega$

and moment of inertia for a disc:

$I=\frac{1}{2} m.r^2$

According to the conservation of angular momentum, the final angular momentum is equal to the initial angular momentum.

$\frac{1}{2} \times M.R^2\times \omega= \frac{1}{2} \times (M.R^2+m.r^2) \omega_f$

$4.9\times 0.2^2\times (2\times 2\pi)=(4.9\times 0.2^2+2.7\times 0.04^2 )\tiems \omega_f$

$\omega_f=12.2954 \,rad.s^{-1}$

$Frequency=1.9569\,rev.s^{-1}$

4 0

4 years ago

The thermal energy in a cup of tea is _____ the thermal energy in a pot of tea at the same temperature.

olga55 [171]

I think it would be 'less than'

8 0

3 years ago

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Why do trains use steel wheels rather than rubber tires? A) Stee

kotegsom [21]

D) steel wheels reduce friction, thus requiring less force to move the load. Friction between rubber and steel would be greater than steel and steel. Friction creates heat, which represents a loss of energy (which has to come from somewhere else - likely from the kinetic energy of the train)

4 0

3 years ago

Read 2 more answers