One of the most amusing things a person can experience is when a car in neutral appears to go uphill when its brakes are release
d. Can this really happen? Note that the car is an isolated system with no external force acting on it.
1 answer:
Answer:
No, it cannot happen. It's just an illusion.
Explanation:
We can blame the horizon for this. Generally people is used to seeing the horizon as horizontal (this is perpendicular to the force of gravity). That's why our brains take the horizon as a reference point. The horizon will help our brains tell when something goes up or down.
What is really going on in these particular roads, is that the horizon is inclined downwards, letting our brains think that the road is going upwards, when it's actually going downwards. (See attached picture).
According to physics, gravity always goes in the direction of the center of the earth (downwards). It happens like that everywhere on earth. When the horizon is inclined downwards, our brains think it is horizontal when it actually isn't. It gives us then the illusion that there is a misterious force pulling things upwards and that's why it might appear that the car is going uphill, but it's actually going downwards as usual.
Unless there is an external force (besides gravity) acting on the car, it is impossible that the car will move upwards on a road. That's why the answer is that it cannot really happen, it's just an illusion.
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Answer:
91.914138 m
Explanation:
t = Time taken
u = Initial velocity = 15.6 m/s
v = Final velocity = -15.6 m/s (it will hit the ground at this speed)
s = Displacement
g = Acceleration due to gravity = 9.81 m/s² = a
The distance the car will travel is 91.914138 m
Answer:
Yes
Explanation:
A position describes the position of an object relative to the x/y-axis (or the four cardinal directions). A velocity is a vector quantity, defining speed with direction.
So if an object is in a positive position, it means they are in the positive x-axis direction (or wherever on the scale the positive values are stated to be) and if it has a negative velocity, it means said object is moving in the opposite direction of the positive x-axis. It is possible for the object to still be in the positive position as it's moving with a negative velocity
Answer:
magnitude of the pressure on the sail in the vicinity of Earth’s Orbit=
Explanation:
The momentum of a photon is:
p = E/c
E = the photon energy
c = the speed of light.
take the time derivative (gives the force)
F = dp/dt = (dE/dt)/c
F = 2(dE/dt)/c (is doubled for complete reflection of the light)
Intensity has the units of energy per unit time per unit area
= I
then,
Force/unit area = 2I/c
magnitude of the pressure on the sail in the vicinity of Earth’s Orbit=