Mechanics | Relativity Answers

a 50 kg sled is pulled by a rope at an angle of 30 degrees above the horizontal with a force of 35 N . this is sufficient to keep the sled moving at a constant speed. What is the coefficient of sliding friction for the sled-snow surface?

The distance between two telephone poles is 40.0 m. When a 1.00-kg bird lands on the telephone wire midway between the poles, the wire sags 0.220 m. How much tension does the bird produce in the wire?

Five forces act on an object.
(1) 62 N at 90°
(2) 40 N at 0°
(3) 85 N at 270°
(4) 40 N at 180°
(5) 50 N at 60°
What are the magnitude and direction of a sixth force that would produce equilibrium?

what is the direction of a person that walks 3.0km north and 4.0km east

Moving man starts int he negative direction with a speed of 3m/s but is accelerating in the positive direction with acceleration of 2.75m/s^2. what is his velocity and displacement at the end of 5.00 seconds?

the world record for the pole vault is about 5.5m.could the record be raised to ,say 8m by using a pole long enough?if not,why not?how high might an athlete get?

A spring stretches by a 100 n force. The displacement of the end of the spring increases 5.0 cm beyond its original stretches positions when the force increases 20% to 120 n. calculate the force constant of the spring and its original displacement.

Kinetic energy or energy in motion depends on the mass and the motion of an object. In formula, KE = 1/2mv^2. An object with 8 m/s has a kinetic energy of 168 joules. how much kinetic energy would it have if its speed were reduced to 2m/s?

a) 10.5 J
b) 21 J
c) 42 J
d) 63 J

a body of mass 60kg and density 800kg/m3 is immersed in water. calculate upthrust acting on the body.

A person walks 22 m East and then walks 38 m at an angle 49 degrees North of East. What is the magnitude of the total displacement?