Mechanics | Relativity Answers

A cat chases a mouse across a 1.5 m high
table. The mouse steps out of the way, and
the cat slides off the table and strikes the floor
2.1 m from the edge of the table.
What was the cat’s speed when it slid off
the table? The acceleration of gravity is
9.81 m/s2 .
Answer in units of m/s

a man walks 7.0miles at 55 degrees north of west. then turns and walks 8.5miles at east. he turns again and walks 2.0 miles at 64 degrees north of east. what is his displacement

A vector A which has magnitude 8.0 is added to a vector B which lies on x-axis.The sum of these two vectors lies on y-axis and has a magnitude twice of the magnitude of vector B.The magnitude of vector B is
a) 8
b) 1.41*8
c) 8/(5)^1/2
d) 8*(5)^1/2

An object is thrown horizontally from a height of 20 m with velocity 10ms-1.Find its velocity after 1s
(g=10ms-2)

a torque of 500 N.m is applied to a fly wheel rotating at 200 rad/s. After 40 s its speed has doubled. What is the flywheel moment of inertia?

A ball kept on a wall is pushed horizontally with
certain velocity and allowed to move under gravity. Sucha
motion is two-dimensional motion with ball covering
displacements in both x and y-directions. But both the x & y
direction motions are independent of each other. Hence,motion in x-direction can be considered as similar to straight
line motion with no acceleration. Motion in y-direction can be
considered as free fall under gravity.
In the figure shown, ball is pushed horizontally from a
height of 19.If there is no energy loss when particle collides at point B on ground, find the maximum
height attained by the particle after it rebounds

two planets have masses in ratio 1:10 and radii in ratio 2:5 compare escape velocity of two planets

raman covers one-fourth of his total journey with a speed of v1 m/s and the remaining journey with a speed of v2 m/s find his average speed

water is kept in a cylindrical container stood upright . the height of the water in the is 1m and radius of container is 10cm .find out the total force by the water on one half part on the cylindrical container.

Crumple zones in cars are designed to reduce the forces during a collision. Explain how they do this.