Mechanics | Relativity Answers

A pair of moving company workers are attempting to lift a 245 kg slate pool table out of a
basement:
What is the normal force on the table, as the workers are attempting to lift it?

The wild thing has a mass of 500 kg with no passengers, at the top of the biggest hill the ride is 63m in the air and moving at 1m/s. Find the gravitational potential energy, kinetic energy and total energy at the top of the biggest hill.

A 60kg student dives from a 10meter platform into the pool below. Determine her Eg at the top of the plat form and label it on the initial bar graph

A ball is thrown vertically upward from the ground level hits the ground after 4s. Calculate the maximum height it reached during the journey.

An object weighing 303 N in air is immersed
in water after being tied to a string connected
to a balance. The scale now reads 272 N .
Immersed in oil, the object appears to weigh
279 N .
Find the density of the object.
Answer in units of kg/m
3
.

A 4600 kg helicopter accelerates upward at 2.0 m/s2. Determine the lift force exerted on the propellers by the air. Make a quantitative force diagram. Write a net force equation for the axis along which forces are not balanced.

A block and tackle system of 5 pulleys is capable of raising load of 300N vertically upward when an effort of 75 N is applied to it downward. Calculate the efficiency of the system

Noah rides his bike 48 miles in 4 hours. What is his average speed in miles per hour?

How do we find displacement from a position time graph

This problem is best done graphically. A ''toy train'' on its way to Darjeeling is speeding up slowly from v=0 to v=40.0 km/hr in 30.0 min and then slows down to a stop over the remaining 20.0 min. Plot v vs t for the train. Using your plot, calculate the distance traveled by the train in 50.0 min. Report the answer accurate to three significant figures.

-----km

B) What is the acceleration of the train in the first 30 min. Express your answer accurate to one significant figure

C.)What is the acceleration in the next 20 min. Express your answer accurate to one significant figure.

---- ×10−3 m/s2