Ask question

Ask question

All categories

2 years ago

10

A van der Graaff generator belt takes 250 electrons up to the ball at the top every second. Assuming that there is no loss, how

long will it have to run to produce a charge of 0.015 pC on the ball?
The answer is 3.75 x 108 s but I don't know to reach it. I appreciate your help

1 answer:

Strike441 [17]2 years ago

6 0

3.75 x 108 is 2000 hope that is right

You might be interested in

Consider your knowledge and experience about caring for children. What have you observed about the needs, behaviors, and abiliti

Advocard [28]

They all have a special way in their age how they want to get taught things but there abilities make them special

5 0

3 years ago

Write an expression for a harmonic wave with an amplitude of 0.19 m, a wavelength of 2.6 m, and a period of 1.2 s. The wave is t

zlopas [31]

Answer:

$y = 0.19 sin(5.23 t - 2.42x + \frac{\pi}{2})$

Explanation:

As we know that the wave equation is given as

$y = A sin(\omega t - k x + \phi_0)$

now we have

$A = 0.19 m$

$\lambda = 2.6 m$

so we have

$k = \frac{2\pi}{\lambda}$

$k = \frac{2\pi}{2.6}$

$k = 2.42 per m$

also we have

$T = 1.2 s$

so we have

$\omega = \frac{2\pi}{T}$

$\omega = \frac{2\pi}{1.2}$

$\omega = 5.23 rad/s$

now we know that at t = 0 and x = 0 wave is at y = 0.19 m

so we have

$\phi_0 = \frac{\pi}{2}$

so we have

$y = 0.19 sin(5.23 t - 2.42x + \frac{\pi}{2})$

6 0

4 years ago

A waiter is carrying a tray above his head and walking at a constant velocity. If he applies a force of 5.0 newtons on the tray

Darya [45]

In physical terms, a force does work if it moves an object in the direction the force is pointing towards.

In your example, the force is pushing a tray up. But the force doesn't move the tray any further up. It remains at the same height.

The is no force done by this force.

3 0

4 years ago

Read 2 more answers

Imagine a leaf floating down a creek (south) at a rate of 6m/s. You walk in the creek towards the leaf (north) at a rate of 2m/s

Juli2301 [7.4K]

It depends on what is the reference frame where the velocity of the leaf (6 m/s) is measured.

If it is measured with respect to the creek, then the answer is simply "6 m/s south".

If it is measured with respect to the observer moving toward the leaf, then the velocity of the leaf relative to the ground is actually the sum between the velocity of the leaf relative to the observer (6 m/s south, so 6 m/s) and the velocity of the observer relative to the ground (2 m/s north, so -2 m/s):

$v=v_l +v_o =6 m/s +(-2 m/s)=4 m/s$

and the direction is south.

8 0

3 years ago

Reducing the lift on an aircraft when landing will increase .............. to allow for better braking ?

Radda [10]

A drag because the lift keeps it up and the drag brings it down

8 0

3 years ago