Mechanics | Relativity Answers

A 21.3 kg box rests on a table. A 16.8 kg box is placed on top of the first box, as shown. Determine the total force in N that the table exerts on the first box.

In 1990, Dave Campos of the United States rode a speacial motorcycle called the Easyrider at an average speed of 518 km/h. Suppose that at some point Campos steadily decreases his speed from 100.0 percent to 60.0 percent of his average speed during an interval of 2.00 min. What is the distance traveled during that time interval?

A stone is thrown from ground level at 79 m/s. Its speed when it reaches its highest point is 60 m/s.
Find the angle, above the horizontal, of the stone’s initial velocity.
Answer in units of ◦

A small sphere is hung by a string from the ceiling of a van. When the van is stationary, the sphere hangs vertically. However, when the van accelerates, the sphere swings backward so that the string makes an angle of θ with respect to the vertical. Find the acceleration of the van when θ = 13.2°.

Two ants race across a table 59 cm long.
One travels at 5.01 cm/s and the other at
3.99999 cm/s.
When the first one crosses the finish line,
how far behind is the second one?

We are standing at a distance d=15 m away from a house. The house wall is h=6 m high and the roof has an inclination angle β=30 ∘. We throw a stone with initial speed v0=20 m/s at an angle α= 38 ∘. The gravitational acceleration is g=10 m/s2.
(a) At what horizontal distance from the house wall is the stone going to hit the roof - s in the figure-? (in meters)
(b) What time does it take the stone to reach the roof? (in seconds)

how long can a 100 watt bulb burn with 1kg of any material??"

in time of flight of projectile why we take the value of gravitational accleration 'g' negative

The maximum vertical distance through which a fully dressed astronaut can jump on the earth is
0.5 m. If mean density of the moon is two thirds that of the earth and radius is one quarter that of
the earth, the maximum vertical distance through which he can jump on the moon and the ratio of
time of duration of the jump on the moon to that on the earth are :

A rubber ball is dropped from a height of 5 m on a plane where the acceleration due to gravity is
not known. On bouncing it rises to a height of 1.8 metre. The ball loses its velocity on bouncing by
a factor of :