Help!!! I don't know this answer.

Answers

Answer 1

Answer: Work = (force on the electron) times (distance the electron is moved).

Can you calculate the force on the electron ?

Sure ! It's pushing against a force of 180 Newtons per Coulomb,
and you know the charge on it.

Do you know the distance it's moved ?

Sure ! That's the 2.5 cm (=0.025 meter) between the plates.

Look at this:

   Work =    (force) x   (distance)

   = (180 N/C) x (1.602 x 10⁻¹⁹ C)   x   (0.025 m)

I get     7.209 x 10⁻¹⁹ N-m. (joules)    Try it and see if you agree.

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A 111 ‑turn circular coil of radius 2.11 cm and negligible resistance is immersed in a uniform magnetic field that is perpendicular to the plane of the coil. The coil is connected to a 14.1 Ω resistor to create a closed circuit. During a time interval of 0.125 s, the magnetic field strength decreases uniformly from 0.669 T to zero. Find the energy, in millijoules, that is dissipated in the resistor during this time interval.

Answers

Answer:

0.0061 J

Explanation:

Parameters given:

Number of turns, N = 111

Radius of turn, r = 2.11 cm = 0.0211 m

Resistance, R = 14.1 ohms

Time taken, t = 0.125 s

Initial magnetic field, Bin = 0.669 T

Final magnetic field, Bfin = 0 T

The energy dissipated in the resistor is given as:

E = P * t

Where P = Power dissipated in the resistor

Power, P, is given as:

P = V² / R

Hence, energy will be:

E = (V² * t) / R

To find the induced voltage (EMF), V:

EMF = [-(Bfin - Bin) * N * A] / t

A is Area of coil

EMF = [-(0 - 0.669) * 111 * pi * 0.0211²] / 0.125

EMF = 0.83 V

Hence, the energy dissipated will be:

E = (0.83² * 0.125) / 14.1

E = 0.0061 J

S-waves can travel through either rock or water.
a. True
b. False

Answers

The statement ‘S-waves can travel through either rock or water’ is true. The answer is letter A. the S waves can pass to both rock and water because the distances between their molecules is shorter compared to air. That is why, when a wave passes through them, the vibration of energy can be easily transported.

Two waves are superposed. One wave has an amplitude of 3 cm, and the other has an amplitude of 4 cm. What is the resultant amplitude?

Answers

Superposition is a principle in physics. Applied to waves, it states that the amplitude of two superposed waves is the sum of the amplitudes of the two individual waves. Then the resultant amplitude of these two waves is 4 cm + 3 cm = 7 cm.

Answer:

7 cm

Explanation:

The time, t, required to drive a fixed distance varies inversely as the speed, r. It takes 9 hr at a speed of 20 km/h to drive a fixed distance. How long will it take to drive the same distance at a speed of 23 km/h?

Answers

Answer:

Time=7.84hrs

Explanation:

This is an inverse proportionality questions

Mathematically time t varies as 1/distance d

Hence T= dk/r

But speed r = distance/t

d= r*t= 9*20=180km/hr

We're k= constant of proportionality

At t=9hrs d=180km/hr

Hence k=r*t/d=20*9/1620=0.111

Finding t at at 1620km for 23km/hr

t=1620*0.111/23=7.84hrs

The water at the top of a waterfall has _____ energy.potential
kinetic
heat
metabolic

Answers

I believe the answer isPOTENTIAL ENERGY. The water at the top of the waterfall has Potential Energy.Potential Energy is defined as the energy that is stored when an object is atrest. At the top of the waterfall, water will have maximum potential energy. Whenthe water falls down, it is will already have kinetic energy which is energythat is produced through continuous motion. When it is finally in the bottom,water will have maximum kinetic energy.

Answer:

The water at the top of a waterfall has __potential___ energy.

Which force is always directed toward the center of a circle?A. normal force
B. nuclear force
C. centrifugal force
D. centripetal force

Answers

The answer is D. centripetal force
This definition of centripetal force is a force acting towards the center of an object moving in a circular motion. Acceleration is the rate of which velocity changes over a period of time. If you pick a point on say a rotating circle and find the tangential velocity at each point it goes through, the acceleration would be towards the middle.

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