Free problems arranged by topic
 Kinematics Dynamics Conservation laws Thermodynamics Waves Electricity Magnetism Optics Fluids and elasticity Ideal gas AC current

 Free problems: all problems
 Kinematics Dynamics Conservation laws Thermodynamics Waves Electricity Magnetism Optics Fluids and elasticity Ideal gas AC current

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# Physics problems:dynamics

Weight, gravitational force

Problem 1.

If an object weighs 30 N on Earth, how much would it weigh on the moon?

Solution

Problem 2.

A child throws a ball downward from a tall building. Note that the ball is thrown, not dropped and disregard air resistance. What is the acceleration of the ball immediately after it leaves the child's hand?

Solution

Problem 7.

The drawing shows three particles far away from any other objects and located on a straight line. The masses of these particles are: partice A = 400 kg, particle B = 500 kg, and particle C = 100 kg. Find the magnitude and direction of the net gravitational force acting on each of the three particles (the direction to the right is positive).

Solution

Problem 13.

The tallest spot on Earth is Mt. Everest, which is 8857 m above sea level. If the radius of the Earth to sea level is 6369 km, how much does the magnitude of g change between sea level and the top of Mt. Everest?

Solution

Problem 14.

The value of g at the surface of the earth is 9.78 N/kg, and on the surface of Venus the magnitude of g is 8.6 N/kg. A cosmonaut has a mass of 60 kg on the surface of the earth. What will her weight be on the surface of Venus?

Solution

Problem 24.

The gravitational force that the sun exerts on the moon is perpendicular to the force that the earth exerts on the moon.

The masses are: Mass of Sun , Mass of Earth: ,, Mass of Moon: . The distance between the sun and moon is , and between the moon and the earth is .

Determine the magnitude of the net gravitational force on the moon.

Solution

Problem 29.

The space shuttle is orbiting the Earth at a distance of about 300 km from its surface. At that distance, the gravitational acceleration is almost the same as that on the surface. How long does it take for the shuttle to complete one orbit around the Earth? Assume that the orbit is circular.

Disregard air resistance.

Solution

Problem 33.

When a falling object is at a distance above the Earth's surface of 4 times the Earth's radius, what is its free-fall acceleration due to the Earth's gravitational force exerted on it?

Solution

Problem 49.

If the mass of a substance is 5 grams what is its weight?

Problem 58.

A box is placed on a roof with an angle of 35 degrees above the horizontal. In order that the box will not damage the roof tiles, the component of the box's gravitational force perpendicular to the roof cannot exceed 425 N. What is the maximum allowable weight of the box?

Solution

Problem 61.

Calculate the pressure exerted by a girl if her mass is 70 kg and area of her foot 1 is and foot 2 is .

Solution

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