Answer:
-100000 N.
Explanation:
Force: This can be defined as the product of the mass of a body and it's acceleration. The S.I unit of Force is Newton(N). The Formula of force is given as,
F = ma ........................... Equation 1
Where F = Average force exerted on the car, m = mass of the car, acceleration of the car, a = acceleration of the car.
a = (v-u)/t..................... Equation 2
Where v = Final velocity, u = Initial velocity, t = time.
Substitute equation 2 into equation 1
F = m(v-u)/t............. Equation 3
Given: m = 1500 kg, u = 20 m/s, v = 0 m/s (brought to rest), t = 0.3 s.
Substitute into equation 3
F = 1500(0-20)/0.3
F = 1500(-20)/0.3
F = -100000 N.
Note: The negative sign is due to the fact that the force exerted on the car by the pole is equal and opposite the force of the car.
True
Mars' atmosphere is over 100 times thinner than Earth's and is primarily composed of carbon dioxide, nitrogen and argon gases. Oxygized dust particles kicked up from the Martian surface fill the atmosphere turning Mars' skies a rusty tan color, according to NASA(opens in new tab).
Water exists on Mars but the atmosphere is too thin for it to last long on the surface in a liquid state. Instead, water on Mars is found below the surface of the polar regions as water-ice and also as seasonal briny water flows down hillsides and crater walls.
Despite Mars' thin atmosphere, the Red Planet still exhibits a dynamic climate and extreme weather events including impressive dust storms and even snow! But Mars hasn't always been this way. NASA's MAVEN mission scientists reported that Mars once had a thick atmosphere(opens in new tab) that could have supported surface liquid water on the surface for extended periods of time.
What is mars?
Mars is the fourth planet from the Sun and the second-smallest planet in the Solar System, being larger than only Mercury. In the English language, Mars is named for the Roman god of war. Mars is a terrestrial planet with a thin atmosphere, and has a crust primarily composed of elements similar to Earth's crust, as well as a core made of iron and nickel. Mars has surface features such as impact craters, valleys, dunes, and polar ice caps. It has two small and irregularly shaped moons: Phobos and Deimos.
To learn more about mars from the given link:
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Answer:
20 km/hr
Explanation:
Distance = 10km
Time = 30 minutes = 1/2 hour
Average Speed = Total distance / Total Time Taken
= 10 ÷ 1/2
= 10 x 2
= 20 km/hr
The distance travelled in 5 seconds is 125 m
Explanation:
The motion of the skydiver is a free fall motion, since he is acted upon the force of gravity only. Therefore, it is a uniformly accelerated motion, with constant acceleration downward, and we can find the distance he travels by using the following suvat equation:
where
s is the distance travelled
u is the initial velocity
t is the time
a is the acceleration
In this problem, we have:
u = 0 (the skydiver jumps from rest)
(acceleration of gravity)
And substituting
t = 5.0 s
we find the distance travelled:
Learn more about free fall:
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Sure. The kinetic energy at the bottom comes from the potential energy
that it had at the top, and the potential energy depends on the height where
it starts from. So the apple that falls from the highest height has the most
potential energy when it starts falling, and the most kinetic energy when
it's done falling.
SIMILARLY ...
If you fall off of the table, you land with more kinetic energy than if you
fall off of a book on the floor.
