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3 years ago

Which point on the wave diagram below are 90° out of phase with each other?

Physics

2 answers:

kiruha [24]3 years ago

8 0

The answer is b and c because both of them are 90 degrees apart and the make a right angle

Vika [28.1K]3 years ago

3 0

Answer:

4. D and E

Explanation:

As we know that the relation between phase difference and path difference is given below

$\delta \phi = \frac{2\pi}{\lambda} \delta x$

now we have to find the distance of two points which are out of phase by 90 degree

so here we will have

$\frac{\pi}{2} = \frac{2\pi}{\lambda} \delta x$

so from above we have

$\delta x = \frac{\lambda}{4}$

so the distance between the points will be 1/4 times of wavelength

so here correct answer is

4. D and E

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A small glass bead has been charged to +20 nC. A small metal ball bearing 1.0 cm above the bead feels a 0.018 N downward electri

Alla [95]

Answer:

$q=1\times10^{-8}C$

Explanation:

Let the charge on the ball bearing is q.

charge on glass bead, Q = 20 nC = 20 x 10^-9 C

Force between them, F = 0.018 N

Distance between them, d = 1 cm = 0.01 m

By use of Coulomb's law in electrostatics

$F=\frac{KQq}{d^{2}}$

By substituting the values

$0.018=\frac{9\times10^{9}\times20\times10^{-9}q}{0.01^{2}}$

$q=1\times10^{-8}C$

Thus, the charge on the ball bearing is $q=1\times10^{-8}C$

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3 years ago

A swimmer, capable of swimming at a speed of 1.0 m/s in still water (i.e., the swimmer can swim with a speed of 1.0 m/s relative

Vesnalui [34]

If the current takes him downstream we must find the resultant vector of the velocities: $V res= \sqrt{1^{2}+0.91^{2} } = \sqrt{1.8281}= 1.3520747$ Then if the river is 3000 m-wide the swimmer will have to pass:
1.3520747 · 300 = 4056.14 m t = 4056.14 m : 1 m/s
a ) It takes 4056.15 seconds ( 1 hour 7 minutes and 36 seconds ) to cross the river.
b ) 0.91 · 3000 = 2730 m
He will be 2730 m downstream.

5 0

3 years ago

Which statement is true about a falling object? (Assume no

vladimir2022 [97]

I would say the answer is 3 because by falling technically the ball would be kind of moving in the air. Plus potential energy is when for example a soccer ball isnt moving

5 0

3 years ago

A strand of 10 lights is plugged into a outlet. How can you determine if the lights are connected in series or parrel

NeTakaya

Answer:

C) Unscrew one light. If the other lights turn off, it's a series circuit.

Explanation:

THIS IS THE COMPLETE QUESTION BELOW;

A strand of 10 lights is plugged into an outlet. How can you determine if the lights are connected in series or parallel? A) Unscrew one light. If the other lights stay on, it's a series circuit. B) Unplug the strand. If the first light stays on, it's a series circuit. C) Unscrew one light. If the other lights turn off, it's a series circuit. D) Cut the strand in half. If the plugged in half stays on, it's a series circuit.

SERIES CIRCUIT

In this circuit, the components there are in the same path, the entire circuit has the same current, each of the components posses different voltage drop. Hence, failure of one components to work, there will be break in entire circuit then other components cease to work.

PARALLEL CIRCUIT

This circuit has equal voltage drop across all the components, any problem in a component will not has effect on other components.

Therefore, if one want to determine if a light connection is in series or in parallel, one of the light can be unplugged if others stop working it means it's series, if other works it's parallel.

5 0

3 years ago

A force is applied to an object at rest with a mass of 100 kg. A force twice as large is applied to another object at rest with

MAVERICK [17]

The second object, the one that had twice the force applied to it, would move twice as far, I believe.

3 0

3 years ago