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BartSMP [9]
3 years ago
13

How much work is done when I apply 200 N of force to a brick wall

Physics
2 answers:
nalin [4]3 years ago
8 0
W=Force*Distance
If you just apply force but do not move the brick, no work has been done.
ElenaW [278]3 years ago
4 0
Noting work's done because in science if you pull up 100000000000000N weight but didn't move from that place to another place it's equal to zero force of work.
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One car has two and a half times the mass of a second car, but only half as much kinetic energy. When both cars increase their s
Leokris [45]

Answer:

v_1 = 7.96 m/s

v_2 = 17.8 m/s

Explanation:

Let the mass of the other car is "m" and its kinetic energy is

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

now the mass of the first car is two and half times and its kinetic energy is half that of other car

so we will have

\frac{1}{2}(2.5m)v_1^2 = \frac{1}{2}(\frac{1}{2}mv^2)

2.5 v_1^2 = 0.5 v^2

v_1 = 0.447 v

now speed of both cars is increased by value of 9 m/s

so now we will have same kinetic energy for both cars

\frac{1}{2}(2.5 m)(0.447v + 9)^2 = \frac{1}{2}m(v + 9)^2

2.5(0.447 v + 9)^2 = (v + 9)^2

1.58(0.447v + 9) = v + 9

0.293v = 5.22

v = 17.8 m/s

so speed of first car is

v_1 = 0.447 v = 7.96 m/s

v_2 = 17.8 m/s

3 0
3 years ago
A 20 kilogram ball rolls down a 10 meter ramp at the rate of 15 meters per second. The kinetic energy is joules
kobusy [5.1K]

Answer:2250J

Explanation:

mass(m)=20kg

velocity(v)=15m/s

Kinetic energy=(m x v^2)/2

Kinetic energy =(20 x 15^2)/2

Kinetic energy =(20x15x15)/2

Kinetic energy=4500/2

Kinetic energy=2250J

3 0
3 years ago
The part of Earth's rocky outer layer that makes up the land masses is the
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África tiene más de 1000 lenguas, pero solo 50 son habladas por más de 500 mil personas, explica si esto es un aspecto positivo
Misha Larkins [42]

Answer:

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7 0
3 years ago
Un móvil se desplaza con una rapidez inicial de 100 km/h, se le aplican los frenos con una
KIM [24]

Answer:

in English please I am quite puzzled

4 0
3 years ago
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