Mechanics | Relativity Answers

A physics professor lifts her 8.2-kg briefcase at constant speed with an upward force. Find the magnitude of her force.

A 10-kg duffle bag is undergoing a vertical acceleration of 0.65 m/s2 (positive for up, negative for down), while its owner is holding it with an upward force. What is the magnitude of this force?

A student applies an upward force of 56 N to a 5.6-kg physics textbook. Find the book’s acceleration (positive for up, negative for down).

Could you stop a tsunami by sending a wave pulse to cause an interference wave using some of the principles of physics?

A lab was conducted to calculate the density of an unknown substance. Two different values were measured, X and Y. Where X, mass, was determined by performing 10 trials, according to the values below

Mass measurements:
7.90, 7.12, 7.82, 7.92, 7.88, 7.83, 7.79, 7.95, 7.91, 7.82

Y, which was the volume measured once from a graduated cylinder was determined to be 78mL which had graduations to the nearest 1mL. There was an uncertainty of 3mL due to mensicus. Calculate the density of the unknown substance.

A particle executes SHM with a time period of 2 sec and amplitude 5cm find
(i)displacement.
(2) velocity (3) acceleration after 1/3 sec starting from mean position.

A girl is sitting on a swing. an other girl by her side what will be the effect on the period time of the swing ?

50 lb block is projected up a 30 incline with an initial velocity of 40 ft/sec. Knowing that the
coefficient of kinetic friction between the block and the incline is 0.2, determine (a) the maximum
distance x that the block will move up the incline. (b) the velocity of the block as it returns to its original
position

A building of 10m high.two objects are projected upwards the 10m high building then the other downwards,with the same unitial velocity of 20m/s at the same time.calculate the time they gona meet and the distances.

An engineer weighs a sample of mercury (ρ =
13.6 × 103 kg/m3) and finds that the weight
of the sample is 5.6 N.
What is the sample’s volume?