Mechanics | Relativity Answers

A force of 5 N is applied to a door perpendicular to its face at a distance of 0.75 m from its hinge. What is the torque on the door about the hinge?

A baseball is thrown with an initial horizontal speed of 20 m/s, and an initial vertical speed of 10 m/s. Find the horizontal distance where the baseball will hit the ground, and the total time of fight. Assume g = 10 m/s2.

A 30 kg block on a frictionless surface experiences two perpendicular forces in the x and y directions. If the force in the x direction is 60 N, and the force in the y direction is 150 N, find the acceleration in the x-direction, the y-direction, and the net resultant acceleration.

. A 980 kg car traveling at 20 m/s rounds a curve of radius 40 m. What is the friction force that must act on the car to keep it in its circular path?

1. A circular disk of radius 30 cm is rotating with an angular velocity of 2 radians / s. What is the tangential velocity of a point on the rim of the disk? What is its centripetal acceleration?

A solid metallic having a volume of .3m^3 is completely submeged in water. The weight of the cube when submerged in water is 52300 N. Determine the kind of material the cube is made of. (density of gold= 19300 kg/m^3 , density of silver= 18200 kg/m^3 , density of copper= 17200 kg/m^3

2 kg bras black is attached to a string and submerged under water. Find the buoyant force and the tension in the rope. ( density of bras=8700 kg/m^3

a body of mass 5kg is displaced through a distance of 2m with uniform accleratiom of 3ms-2 calculate work done

Maria is racing her bike down the cobblestone sidewalk. She is riding at a constant velocity of 10.2m/s. Suddenly a group of people step out in front of her. They are 6 meters in front and she needs to stop. The coefficient of friction between the ground and Maria's tire is 0.35. The mass of her + her bike is 130kg. She slams the brakes with 800N of force. Will she be able to stop in time? Or will she run over the people?

Suppose that your favorite AM radio station broadcasts at a frequency of 1600 kHz. What is the wavelength in meters of the radiation from the station?