Physics Answers

Three forces F1 , F2 , and F3 act on an object with mass 25 kg.

The forces are the following:

F1 = 3i 6j + 3k

F2 = 5i + 9j + 2k

F3 = 6i + 3j - 6k ,

where the forces are measured in Newtons. (a) What is the net force vector? (b) What is

the magnitude of the net force? (c) What is the acceleration vector? (d) What is the

magnitude of the acceleration vector?

"The magnitude of the force between two charges of 1.5µc each that 5cm apart."

A small source of sound waves emits uniformly in all directions. The total power output of the source is P. By what factor must P increase if the sound intensity level at a distance of 20.0 m from the source is to increase 5.00 dB?

In the magnetic field B with strength 3T, what is the magnitude of a force on the charge q 2C moving at the velocity of 500 m/s in the north direction?

A 48 kg mass is sitting on a frictionless surface. An unknown constant force pushes the mass for 3 seconds until the mass reaches a velocity of 3.7 m/s.

a) What is the initial momentum of the mass?

b) What is the final momentum of the mass?

c) What was the force acting on the mass?

d) What was the impulse acting on the mass?

A model rocket blasts off from the ground, rising straight upward with a constant acceleration that has a magnitude of 74.3 m/s² for 1.80 seconds, at which point its fuel abruptly runs out. Air resistance has no effect on its flight. What maximum altitude (above the ground) will the rocket reach?

Calculate the pressure exerted on a diver at 60 m below the free surface of the sea.

The barometric pressure is 101 kPa and the specific gravity of seawater is 1.03.

A car starts from rest and reaches a speed of 45km/hr in 20s. it travels at this speed for ½ a kilometre and then comes to rest uniformly in 30 s Find;

a)Acceleration

b)total distance traveles

Box of mass 20 kilograms is kept on a smooth horizontal surface. Object of mass 16 kilograms is kept on the box. The two objects are connected by a light in extensible string and the string goes over smooth Pulley. A force of 6 Newton is applied on the box, the acceleration of the box?

A car accelerates from 4m/s to 20m/s in 8s. how far does it travel in time?