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3 years ago

A student who weighs 500N climbed the stairs from the first floor to the third floor, 15m above, in 20s. What was her power? *

1 answer:

7 0

For the gravitational force F, the Work is given by W = F*h, where h represents the height of the student.
Power P = W / t, where t is time.

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The period of a mechanical wave is 5 seconds. What is the frequency of the wave?

viva [34]

The frequency of a wave is just the reciprocal of the period.For this one . . .
Frequency = 1/(period) = 1/(5 sec) = 0.2 per sec (0.2 Hz) .

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3 years ago

7. A car travels at 25 m/s to the North. It has an acceleration of 2 m/s to the south

tamaranim1 [39]

Answer:

-0.5 m/s2 as it comes to rest.

Explanation:

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3 years ago

I. )Which unit can be used to express force?

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3 years ago

In a cyclotron, the orbital radius of protons with energy 300 keV is 16.0 cm . You are redesigning the cyclotron to be used inst

dem82 [27]

Answer:

$r_\alpha=16cm$

Explanation:

The radius of the circumference described by a particle in a cyclotron is given by:

$r=\frac{mv}{qB}(1)$

m is the particle's mass, v is the speed of the particle, q is the particle's charge and B is the magnitude of the magnetic field.

Kinetic energy is defined as:

$K=\frac{mv^2}{2}=\frac{m^2v^2}{2m}\\$

Solving this for mv:

$mv=\sqrt{2mK}(2)$

Replacing (2) in (1):

$r=\frac{\sqrt{2mK}}{qB}$

For protons, we have:

$r_p=\frac{\sqrt{2m_pK}}{eB}(3)$

For alpha particles, we have:

$r_\alpha=\frac{\sqrt{2m_\alpha K}}{(2e)B}(4)$

Dividing (4) in (3):

$\frac{r_\alpha}{r_p}=\frac{\frac{\sqrt{2m_\alpha K}}{(2e)B}}{\frac{\sqrt{2m_p K}}{(e)B}}\\r_\alpha=\frac{r_p}{2}\sqrt{\frac{m_\alpha}{m_p}}\\r_\alpha=\frac{16cm}{2}\sqrt{\frac{6.64*10^{-27}kg}{1.67*10^{-27}kg}}\\r_\alpha=\frac{16cm}{2}(\sqrt{3.98})\\\\r_\alpha=\frac{16cm}{2}(2)\\r_\alpha=16cm$

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4 years ago

A table of mass 10 kg is lifted so that the gravitational potential energy of the table increases by 1470 J. How high is the tab

Kryger [21]

15 meters due to the fact that gravitational potential energy equals mass times gravity times height.

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3 years ago

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