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viktelen [127]
3 years ago
9

HEY PLEASE HELP AM DESPERATE!!!!!!

Physics
2 answers:
MariettaO [177]3 years ago
4 0

Answer:

Runner A

Explanation:

Both B and C finished the race from 25 seconds

But A runner finished it from 20 seconds

MAVERICK [17]3 years ago
3 0

Answer:

runner<em> </em><em>A</em><em> </em><em>is</em><em> </em><em>win</em><em> </em>

Explanation:

  • because he take smallest time

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How can you tell if something has a lot of kinetic energy? How can you tell if something only has a little bit of kinetic energy
dezoksy [38]

Based on the equation KE = 1/2(m)(v^2), Kinetic Energy can be measured based on velocity. If an object has a large velocity, it have a larger kinetic energy than if the velocity is small.

Hope this helps.

If this helped you, please vote me as brainliest!

3 0
3 years ago
Help with this review pls!!
o-na [289]
40 50 60 85 954 746 ity
5 0
3 years ago
Read 2 more answers
61. A physics student has a single-occupancy dorm room. The student has a small refrigerator that runs with a current of 3.00 A
Mademuasel [1]

Answer:

Part a)

percentage = 21.3%

Part b)

percentage = 2.13 \times 10^{-5}%

Explanation:

As we know that total power used in the room is given as

P = P_1 + P_2 + P_3 + P_4

here we have

P_1 = (110)(3) = 330 W

P_2 = 100 W

P_3 = 60 W

P_4 = 3 W

P = 330 + 100 + 60 + 3

P = 493 W

Part a)

Since power supply is at 110 Volt so the current obtained from this supply is given as

110\times i = 493

i = 4.48 A

now resistance of transmission line

R = \frac{\rho L}{A}

R = \frac{(2.8 \times 10^{-8})(10\times 10^3)}{\pi(4.126\times 10^{-3})^2}

R = 5.23 \ohm

now power loss in line is given as

P = i^2 R

P = (4.48)^2(5.23)

P = 105 W

Now percentage loss is given as

percentage = \frac{loss}{supply} \times 100

percentage = \frac{105}{493} \times 100

percentage = 21.3%

Part b)

now same power must have been supplied from the supply station at 110 kV, so we have

110 \times 10^3 (i ) = 493

i = 4.48\times 10^{-3} A

now power loss in line is given as

P = i^2 R

P = (4.48 \times 10^{-3})^2(5.23)

P = 1.05 \times 10^{-4} W

Now percentage loss is given as

percentage = \frac{loss}{supply} \times 100

percentage = \frac{1.05 \times 10^{-4}}{493} \times 100

percentage = 2.13 \times 10^{-5}%

6 0
3 years ago
A 7800 W lift took 10 seconds to move a 5000 N weight. How far did the lift move this weight?
Eduardwww [97]

Answer:

Both are moving at 30 km/h, so their speed is the same. ... enough fuel for the trip/how long it will take. 4 Weight is a force, and so is a vector. ... c At 10 seconds David's displacement is.

7 0
3 years ago
A 200kg ball on the end of string is swung in horizontal circle with radius of 0.5m . The ball makes revolution every 2second th
kondaur [170]

The speed of the ball is 1.57 m/s

Explanation:

We start by calculating the angular speed of the ball, which is given by

\omega = \frac{2\pi}{T}

where

T is the period of revolution

For the ball in this problem,

T = 2 s

(since the ball makes 1 revolution every 2 seconds)

So, the angular speed is

\omega = \frac{2\pi}{T}=\frac{2\pi}{2}=\pi rad/s

Now we can calculate the speed of the ball by using

v=\omega r

where

r = 0.5 m is the radius of the circular path

Substituting,

v=(\pi)(0.5) = 1.57 m/s

Learn more about angular motion:

brainly.com/question/9575487

brainly.com/question/9329700

brainly.com/question/2506028

#LearnwithBrainly

5 0
3 years ago
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