Mechanics | Relativity Answers

Margie, who weighs 543 N, is standing on a bathroom scale that weighs 45 N. (a) With what magnitude force does the scale push up on Margie? (b) What is the interaction partner of that force? (c) With what magnitude force does the floor push up on the scale? (d) Identify the interaction partner of that force.

A cyclist increases her speed uniformly from 3m/s over a distance of 40m. Calculated the magnitude of the acceleration of the cyclist over this distance

A train is travelling23m/s its speed expressed in km is

Explain the following
Mechanics and particle dynamics

1)A ball of mass 4 kg rolls up a slope at an angle of 25° to the horizontal. The coefficient of friction
is 0.3. (i) Given the initial speed is 9 m s−1, find the distance the ball travels up the slope until it
comes to rest. (ii) Show that after coming to rest, the ball will start rolling back down the slope. (iii) Find the speed of the ball when it returns to its starting point
2)

Define the following terms: (i) Displacement (ii) Velocity (iii) Acceleration (iv) Distance (v) Speed.

A sack slides off the ramp, shown in Fig. 3, with a horizontal velocity of 12 m/s. If the height of the ramp is 6 m from the floor, determine the time needed for the sack to strike the floor and the range R where sacks begin to pile up.

A train travels at a constant speed of 60 mi/h and crosses over a road as shown in Fig. 2. If the automobile A is traveling at 45 mi/h along the road, determine the magnitude and direction of the velocity of the train relative to the automobile.

At the instant shown in Fig. 1, cars A and B are traveling with speeds of 18 m/s and 12 m/s, respectively. Also at this instant, A has a decrease in speed of 2 m/s2, and B has an increase in speed of 3 m/s2
velocity and acceleration of B with respect to A.