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Rus_ich [418]
3 years ago
13

The brakes in a car increase in temperature by ΔT when bringing the car to rest from a speed v. How much greater would ΔT be if

the car initially had twice the speed? You may assume the car to stop sufficiently fast so that no heat transfers out of the brakes.\
Physics
1 answer:
Wewaii [24]3 years ago
4 0

Answer:

T would be two times the temperature That it was before the double so if the initial temperature was 20 it would now be 40

Explanation:

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What should be angle between force and displacement to get the maximum work​
Bas_tet [7]

Answer:

0°

Explanation:

The angle between force and displacement should be 0° in order to get the maximum work done.

 

 Work done  = Force  x dcosФ°  

  Ф is the angle between force and displacement

When Ф is zero, the maximum work done is attained

When Ф is 90, the minimum work is done, in fact, work done is 0

3 0
3 years ago
A sound wave of frequency
Artyom0805 [142]

Answer:

0.283m

Explanation:

Speed (v) = wavelength × Frequency (f)

Wavelength = speed/ frequency

Wavelength = 343/ 1210 = 0.283m

8 0
3 years ago
Light of wavelength 441.1 nm falls on two slits spaced 0.29 mm apart. What is the required distance from the slits to the screen
pshichka [43]

Answer: R = 0.131 m

Explanation: The formulae for the distance between a fringe and the first (center) is given by

y = R×mλ/d

Where y = distance between first and nth fringe = 4mm = 4×10^-3m

λ = wavelength of light = 441.1nm = 441.1×10^-9m

R = distance between slits and screen =?

d = distance between slits = 0.29mm = 2.9×10^-4m

4×10^-3 = R ×2 ×441.4×10^-9/ 2.9×10^-5

Hence R = (4×10^-3) ×(2.9×10^-5)/2×441.4×10^-9

R = 1.16 × 10^-7/8.828×10^-7

R = 1.16/8.828

R = 0.131 m

8 0
3 years ago
A small, uncharged metal sphere is placed near a larger, negatively charged sphere. Which diagram best represents the charge dis
Rudik [331]

Answer:

I'm sorry I don't know what is the answer

3 0
3 years ago
A boy whirls a stone in a horizontal circle of radius 1.50m and at height 2.00m above level ground. The string breaks, and the s
Eddi Din [679]

Answer:

a_{cp}=162.2m/s^2

Explanation:

The time the stone takes to fall can be calculated considering only the vertical component with the formula:

y=y_0+v_{0y}t+\frac{a_yt^2}{2}

Taking the inital height as 0m and downward direction positive, since it departs from (vertical) rest we have:

y=\frac{gt^2}{2}

Which gives us a time:

t=\sqrt{\frac{2y}{g}}=\sqrt{\frac{2(2m)}{(9.8m/s^2)}}=0.64s

Horizontally, on that time the stone travelled a distance x=10m, which means its horizontal speed was:

v_x=\frac{x}{t}=\frac{10m}{0.64s}=15.6m/s

Since <u>this speed is the tangential velocity</u> while whirling, the centripetal acceleration of the stone was:

a_{cp}=\frac{v_x^2}{r}=\frac{(15.6m/s)^2}{(1.5m)}=162.2m/s^2

7 0
3 years ago
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