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Lostsunrise [7]
3 years ago
5

HURRY!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Physics
1 answer:
Anastasy [175]3 years ago
5 0
Light energy from the sun I think thats the answer
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In braking an automobile, the friction between the brake drums and brake shoes converts the car's kinetic energy into heat. If a
satela [25.4K]

To solve this problem it is necessary to apply the concepts related to energy conservation.

In this case the kinetic energy is given as

KE = \frac{1}{2} mv^2

Where,

m = mass

v= Velocity

In the case of heat lost energy (for all 4 wheels) we have to

Q = mC_p \Delta T \rightarrow 4Q = 4mC_p \Delta T

m = mass

C_p = Specific Heat

\Delta T= Change at temperature

For conservation we have to

KE = Q

\frac{1}{2} mv^2 = 4mC_p \Delta T

\Delta T = \frac{1}{2}\frac{mv^2}{4mC_p}

\Delta T = \frac{1}{2}\frac{(1500)(30)^2}{4(8)(448)}

\Delta T = 47.084\°C \approx 47\°C

Therefore the temperature rises in each of the four brake drums around to 47°C

4 0
3 years ago
A worker pushes a crate horizontally across a warehouse floor with a force of 245 N at an angle of 55 degrees below the horizont
aev [14]

Answer:

option A

Explanation:

given,

For exerted by the worker = 245 N

angle made with horizontal = 55°

we need to calculate Force which is not used to move the crate = ?

Movement of crate is due to the horizontal component of the force.

Crate will not move due to vertical force acting on the it.

F_y = F sin \theta

F_y = 245\times sin 55^0

F_y =200.69

hence, worker's force not used to move the crate is equal to 200.69

The correct answer is option A

6 0
3 years ago
Read 2 more answers
Why do radio waves have the lowest frequency of all the waves on the electromagnetic spectrum?
lara [203]

Explanation:

Electromagnetic waves are the waves which are created as the result of the electrical waves which are perpendicular to each other and also perpendicular to the direction of propagation.

Electromagnetic spectrum is range of the frequencies and their respective wavelengths of the various type of the electromagnetic radiation.

In order of the increasing frequency and the photon energy and the decreasing wavelength the spectrum are:  

radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X-rays and gamma rays.

The energy of the radio waves photons is the lowest of all the other waves in the electromagnetic spectrum.

Also, E={h\times \nu}

Where,  

h is Plank's constant having value 6.626\times 10^{-34}\ Js

Thus, energy is directly proportional to the frequency. The radio waves have the lowest frequency.

8 0
3 years ago
What's the answer plz help?!
eimsori [14]
I think the answer is c chemical change
6 0
3 years ago
Read 2 more answers
If a resistor draws 1.2 x 10^-3 a of current from a 12 v battery, then what is the value of the resistor?
bixtya [17]
Value of resistor = (12V) /(1.2 x 10^-3A)=10000ohms=10k ohms
8 0
4 years ago
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