A rock (m= 2kg) is shot up vertically at the same time that a ball (m= 0.5kg) is projected horizontally. If both start from the
same height: A. the rock and ball will reach the ground at the same time. B. the rock will reach the ground first.
C. the ball will reach the ground first.
D. the rock and ball will collide in the air before reaching the ground.
Can you explain why the answer is C?
The correct option is C. the ball will reach the ground first.
The ball will reach the ground first since the mass of each object does not affect the rate of fall, both are subject to the same gravitational acceleration 9.81 m / s2. The rock in its vertical movement invests a time that the ball is not released horizontally, so that time of vertical flight of the rock plus the extra height it will have will reach the ground after the rock. Regardless of the friction of the air, it will be different in both objects.
A 500.0 kg module is attached to a 440.0 kg shuttle craft, which moves at 1050. m/s relative to the stationary main spaceship. Then a small explosion sends the module backward with speed 100.0 m/s relative to the new speed of the shuttle craft. As measured by someone on the main spaceship, by what fraction did the kinetic energy of the module and shuttle craft, Ki, increase because of the explosion?
M=500 kg, m=440 kg
V=1000 m/s, v = 100 m/s
Let relative speed =Vs
Momentum rule says
Vs= 990000/940=1053.19 m/s
So, the module speed = Vs-v=1053.19-100=953.19 m/s
A moon generally do not have or possess light but rather it reflects the light from the sun.
The moon is lit by light bouncing off of it. That light reaches Earth as moonlight. The different shapes that the moon appears to have are called phases. The moon goes through eight (8) phases as it revolves around the earth every 29 days. The phase that we see depends on how much of the sunlit part of the moon we can see. This depends on the positions of the earth, sun, and moon.
The eight (8) phases of the moon include the following;