Physics Answers

The pressure below the depth of 25 m of a homogenous fluid is 50.473 psi.

Calculate specific weight in kN/m3,density of fluid in kgm/m3 and its specific

gravity

Two spherical objects have masses of 1.5 x 105 kg and 8.5 x 102 kg. Their centers are separated by a distance of 2500 m. Find the gravitational attraction between them.

A crane used 112.95 watts of power to raise a 17.74 N object in 4.05 seconds. Through what vertical distance was the object displaced?

Trucks carrying flammable liquids like gasoline often become electrically charged. How is the possibility of an explosion prevented?

Determine the charge of each atom if it is composed of the following particles:

1. 5 electrons and 5 protons

2. 6 protons and 5 electrons

Compute the charge of the following ions. Show your solution.

1. Anion with a charge of -3

2. Cation with a charge of +2

3. Anion with a charge of +5

A stone is thrown upward from the top of a building at an angle of 30.0° to the

horizontal and with an initial speed of 20.0 m/s. The point of release is 45.0 m above the

ground.

a. How long does it take to hit the ground?

b. Find the stone’s speed impact.

c. Find the horizontal range of the stone.

A stone is thrown upward from the top of a building at an angle of 30.0° to the

horizontal and with an initial speed of 20.0 m/s. The point of release is 45.0 m above the

ground.

a. How long does it take to hit the ground?

b. Find the stone’s speed impact.

c. Find the horizontal range of the stone.

work done on the steady flow system is 30 kJ/kgm. Calculate the heat in HP 

if the mass flow rate of fluid is 10 kg per minute given that the internal energy 

is decreased by 10 kJ/kgm and the fluid flow is increased by 20 kJ/kgm. Also, 

identify if the heat is added to the system or rejected by the system

A point charge Q1 at x= 1 m and a charge Q2 at x= d. What is the relationship between these charges if the resulting electric field is zero at the following points: a) x= d/2 b) x= 2d c) x= -d/2?

(Answer: a) Q1/Q2= 1 b) Q1/Q2= -4 c) Q2/Q1= -9)