Mechanics | Relativity Answers

Determine the center of mass of three plates filled with food on a table. The plates have the following masses, correspond to by their arbitrary coordinates; m1 = 2 kg; (-3, -1) m2 = 3 kg; ( 2, 2) m3 = 5 kg; ( 3, -3) draw the diagram locate the points show complete solutions

A hole of cross-sectional area 100cm² is cut in a piece of steel at 20⁰c.

What is the area of the hole if the steel is heated from 20⁰c to 100⁰c?

The coefficient of linear expression of steel is 1.10 * 10–5⁰c

A ball is kicked by 30m/s at angle 37degree from the horizontal. find total time flight

Make a displacement vs time graph of the following succession of events.

1) From 0 to 5 seconds, the object moves with constant velocity at 2 m/s

2) From 5 to 8 seconds, the object constantly decelerate at -1m/s^2 (the portion of this graph is parabolic)

3) From 8 to 12 seconds, the object remain at rest

A and B are the same two long boards resting on the smooth and horizontal ground, the length is Lに0.75m, the left end of A is in contact with the square end of B, and the masses of the two boards are both M -2. Okg.C is a small block with a mass = 1.0kg. Now give it an initial velocity of v2.Om/s. Make it start from the left end of the B board and slide to the right. It is known that the dynamic friction factor between c, A and B is human white "-0.20, and finally C and A remain relatively stationary. Take the acceleration of gravity g = 10m / s', and find the final velocity of the board A and B respectively ?

2. A place-kicker must kick a football from a point 36.0 m from the goal. Half the crowd hopes the ball will clear the crossbar, which is 3.05 m high. When kicked, the ball leaves the ground with a speed of 20.0 m/s at an angle of 53.0° to the horizontal. A. By how much does the ball clear or fall short of clearing the crossbar? B. Does the ball approach the crossbar while still rising or while falling?

1. A student stands at the edge of a cliff and throws a stone horizontally over the edge with a speed of 18.0 m/s. The cliff is 50.0 m above a flat, horizontal beach. Refer to the figure on the module posted. 

A. What are the components of the initial velocity?

B. How long after being released does the stone strike the beach below the cliff?

C. With what speed and angle of impact does the stone land?

A 24-N horizontal force is applied to a 40-N block initially at rest on a rough horizontal

surface. If the coefficients of friction are µs = 0 .5 and µk = 0 .4, find the magnitude of the

frictional force on the block

A block of mass m1, placed on an inclined smooth plane is connected by a light string passing over a smooth pulley to mass m2, which moves vertically downwards. Find the tension in the string.