Answer:
they can blend in with their suroundings
Explanation:
Answer:
0.125m/s^2
Explanation:
20-10=10
10 divided by 80=0.125m/s^2
The force is -12,000 N
Explanation:
First of all, we calculate the acceleration of the ball, by using the following suvat equation:
![v^2-u^2=2as](https://tex.z-dn.net/?f=v%5E2-u%5E2%3D2as)
where:
v = 0 is the final velocity of the baseball (it comes to rest)
u = 40 m/s is the initial velocity
a is the acceleration
s = 2.0 cm = 0.02 m is the displacement of the ball
Solving for a,
![a=\frac{v^2-u^2}{2s}=\frac{0-40^2}{2(0.02)}=-40,000 m/s^2](https://tex.z-dn.net/?f=a%3D%5Cfrac%7Bv%5E2-u%5E2%7D%7B2s%7D%3D%5Cfrac%7B0-40%5E2%7D%7B2%280.02%29%7D%3D-40%2C000%20m%2Fs%5E2)
Now we can calculate the average force exerted on the ball, by using Newton's second law:
![F=ma](https://tex.z-dn.net/?f=F%3Dma)
where
m = 300 g = 0.3 kg is the mass of the ball
is the acceleration
Substituting,
![F=(0.3)(-40,000)=-12,000 N](https://tex.z-dn.net/?f=F%3D%280.3%29%28-40%2C000%29%3D-12%2C000%20N)
where the negative sign indicates that the direction of the force is opposite to the direction of motion of the ball.
Learn more about forces:
brainly.com/question/8459017
brainly.com/question/11292757
brainly.com/question/12978926
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Answer:
The riders work becomes a combination of gravitational potential,
kinetic energy and heat.
Explanation:
His work becomes gravitational potential as the raider gains height. This can be seen from the equation of gravitational potential:
,
where m is the mass, g is the gravity and h is the height. Since the rider's final position is higher than his starting position the change of gravitational position is greater than 0.
His work becomes kinetic energy as he gains speed: assuming he was at rest at starting position he must increase his speed to move to the top of the hill, and because kinetic energy depends on speed, part of his work becomes kinetic energy.
Finally, part of his work turns into heat due to all the losses because of the friction in the bicycle gears.