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3 years ago

Hi :) why is the second last (about radiation through vacuum) false?

Physics

1 answer:

Sladkaya [172]3 years ago

8 0

Answer:

Explanation:

This would be false because thermal energy transfer through radiation can also travel through matter as well as the vacuum.

(sorry i'm not to good at explaining things)

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Two converging lenses, one with f = 4.0 cm and the other with f = 37 cm , are made into a telescope. What is the length of this

d1i1m1o1n [39]

Answer:

The length and the magnification of this telescope are 41 cm and 0.108.

Explanation:

Given that,

Focal length of first lens f= 4.0 cm

Focal length of other lens f'= 37 cm

We need to calculate the length of the telescope

Using formula of length

$L=f+f'$

Put the value into the formula

$L=4+37=41 cm$

We need to calculate the magnification of the telescope

Using formula of the magnification

$m=\dfrac{f}{f'}$

Put the value into the formula

$m=\dfrac{4}{37}$

$m=0.108$

Hence, The length and the magnification of this telescope are 41 cm and 0.108.

8 0

4 years ago

Two spherical objects are separated by a distance that is 9.00 X 10m The objects are initially electrically neutral and are very

romanna [79]

Answer: 3.2 * 10^-3 C

Explanation: In order to solve this problem we have to use the Coulomb force given by:

F=k*q^2/ d^2 where he consider the same charge for each point

so, we have

q^2= F*d^2/k= 1.137* (10 C*9*10m)^2/9*10^9 N*m^2/C^2)=3.2 * 10^-3 C.

5 0

3 years ago

A stalled car is being pushed up a hill at constant velocity by three people. the net force on the car is

frosja888 [35]

I think you need more information like the force of gravity and the force of the three people. Once you combine the two, however, you should get the net force.

6 0

3 years ago

When a football is kicked, the action and reaction forces do NOT cancel each other out because

AfilCa [17]

Answer:

Explanation:

The kicker exerts more force of the football which is why the football moves when its kicked.

6 0

3 years ago

how fast will and in what direction will a 20kg object accelerate if one force pushes at a 30 degree angle and another pushes at

DiKsa [7]

Answer:

$|a|=2.83\ m/s^2$

$\theta=75^o$

Explanation:

<u>Net Force And Acceleration </u>

The Newton's second law relates the net force applied on an object of mass m and the acceleration it aquires by

$\vec F_n=m\vec a$

The net force is the vector sum of all forces. In this problem, we are not given the magnitude of each force, only their angles. For the sake of solving the problem and giving a good guide on how to proceed with similar problems, we'll assume both forces have equal magnitudes of F=40 N

The components of the first force are

$\vec F_1=$