1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
tiny-mole [99]
2 years ago
12

One observer stand on a train moving at a constant speed, and one observer stands at rest on the ground. The person on the train

stands at the back of the car and turns on a flashight; the light travels to the front of the car, bounces off a mirror, and returns to the back of the car (assume the light is traveling in a vacuum). the observer on the train measures the time it takes for the light to take this path and knowing the length of the car, calculates the speed of light. What value does he obtain?
a) Greater than c

b) Equal to c

c) Less than c

d) The speed of the light canot be determined without knowing the speed of the train
Physics
1 answer:
ANTONII [103]2 years ago
3 0

Answer:

b) Equal to c

Explanation:

According to relativity, the speed of light in free space is constant in all inertial reference frame.

You might be interested in
a wire is carrying a 2.45 A current. at what distance from the wire is the magnetic field 1.00x10^-6t
balu736 [363]

Answer:

0.49m

Explanation:

So you need to change the original equation for finding fields to find distance, and then just plug in the numbers

Which equals 0.49meters

Also it was right on Acellus :)

Hope this helps

5 0
3 years ago
A capacitor is made from two hollow, coaxial, iron cylinders, one inside the other. The inner cylinder is negatively charged and
notsponge [240]

Answer: 1) 17.65 * 10^-12 C/V; 2) 0.68 V

Explanation: In order to calculate the capacitance of one cylinder capacitor we have to use the following expression:

C=\frac{2\pi \epsilon o L}{ln (b/a)} where and b are the inner and outer radius of teh cylinder, respectively. L is length of the cylinder.

Finally we also kwn that C=Q/ΔV

then we have

ΔV =Q/C

ΔV = 12 * 10^-12/17.65*10^-12= 0.68V

3 0
2 years ago
A car travels with a velocity 16m/s and accelerates 5m/s^2. Calculate the final velocity when it has travelled 36.9m
marissa [1.9K]

v²=u²+2as

v²=16²+2×5×36.9

v²=625

√v²=√625

v=25

--------

--------

4 0
3 years ago
Doubling the frequency of a wave source doubles the speed of the wave assuing that wavelength remains the same? True or false? W
SVETLANKA909090 [29]

Answer:true,because velocity is directly proportional to speed or velocity

Explanation:

Velocity = frequency x wavelength

The velocity or speed varies directly with the frequency, so as the frequency is increased, the velocity or speed is also increased

8 0
3 years ago
A car traveling on a flat (unbanked) circular track accelerates uniformly from rest with a tangential acceleration of 1.7 m/s^2.
Komok [63]

Answer:

The coefficient of static friction between the car and the track

u=0.572

Explanation:

We don't know the mass of the car or any other information so the acceleration is the reason to solve the friction coefficient

∑F=F_{f}=m*a_{t}

As we know

F_{f}=u*F_{N}=u*m*g

Also the center ward direction forces

F_{fc}=m*a_{c}

a_{c}=\frac{v_{t}^2}{r}

F_{fc}=m*\frac{v_{t}^2}{r}

But now vt relation with the tangential acceleration

v_{t}=2*a_{t}*\frac{\pi }{r}

replacing

F_{fc}=m*a_{t}*\frac{2\pi*r}{2r}

F_{fc}=m*a_{t}*\pi

So magnitude of the force can get by

F_{f}=\sqrt{(m*a_{t}*\pi)^{2}+(m*a_{t})^{2}}

Get the factor to simplify

F_{f}=a_{t}*m*\sqrt{(1+\pi^2)}

u*m*g=m*a_{t}*(\sqrt{1+\pi^2})

Solve to u'

u=\frac{a_{t}}{g}*(\sqrt{1+\pi^2})

u=\frac{17\frac{m}{s^2} }{9.8\frac{m}{s^2}}*(\sqrt{1+\pi^2})=0.572

5 0
3 years ago
Other questions:
  • A 30 g particle is undergoing simple harmonic motion with an amplitude of 2.0 ✕ 10-3 m and a maximum acceleration of magnitude 8
    11·2 answers
  • What is cumulative force?
    5·1 answer
  • For a given initial velocity, how does the time td it takes to stop on dry snow differ from the time tw it takes to stop on wet
    11·1 answer
  • Which term describes the amount of heat needed to change 1 kg of a substance from solid to liquid at its melting point? A. Speci
    13·1 answer
  • Jason took 6 hours to travel 540 km. For the first 140 km, he
    13·1 answer
  • Please help on this one? :)
    7·1 answer
  • A roller coaster uses the track in this picture. Where will the roller coaster car have the most potential energy?
    11·1 answer
  • In the equation, y = A sin( wt - kx ), obtain the dimensional formula ' w ' and ' k.​
    11·1 answer
  • A torsional pendulum is formed by attaching a wire to the center of a meter stick with a mass of 5.00 kg. If the resulting perio
    15·1 answer
  • The duration between the emission of the sound from the echo reception is: t - 1.5 s. the distance between the observer and the
    6·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!