A man pulls a sled at a constant velocity across a horizonta

A man pulls a sled at a constant velocity across a horizontal snow surface. If a fore of 80 N is being applied to the sled rope at an angle of 53 degree to the ground, what is the force of friction between sled and snow? A) 40 N B) 20 N C) 64 N D) 48 N E) 80 N A block of mass 5.0 kg rests on a horizontal surface where the coefficient of sliding kinetic friction between the two is 0.2. A string attached to the block is pulled horizontally, resulting in a 2 m/s^2 acceleration by the block. Find the tension in the string. (g - 9.8 m/s^2) A) 9.8 N B) 5 N C) 10 N D) 0.2 N E) 19.8 N If Force - (-4, 1) and Displacement = (-2, -3), find the angle in degrees between the two vectors. A) 88 B) -52 C) 125 D) 45 E) 71 If Force - 3 x^3 - 2 x, find the work done by the force for a distance of x = 1 to x = 3. A) 0 B) 52 C) 81 D) 20 E) 60.75 A spring of spring constant of 10000 N/m and compressed by, 3 m accelerates a 5 kg mass down a frictionless incline from a height of 4 m. What is the speed of the mass at the bottom of the inclined plane? A) 24 m/s B) 16 m/s C) 8.85 m/s D) 12 m/s E) 3 m/s A 500 N tightrope walker stands at the center of the rope such that each half of the rope makes an angle of 10 degree with the horizontal. What is the tension in the rope? A) 2900 N B) 1440 N C) 1000 N C) 1000 N D) 50 N E) 500 N Find the force from the Figure. A) 50 N B) 25 N C) 200 N D) 100 N E) 40 N A 1000 kg sports car accelerates from zero to 25 m/s in 7.5 s. What is the average power delivered by the automobile engine? A) 30.3 kW B) 68.8 kW C) 20.8 kW D) 41.7 kW E) 52.4 kW A hill is 100 m long and makes an angles of 12 degree with the horizontal. As a 50 kg jogger run hill, how much work does gravity do on the jogger? A) 10,000 J B) 1200 J C) 49,000 J D) -10,000 J E) zero.

Solution

1.

The force if friction is calculated as follows

F = Tcos@=48 N

Option D is correct

2.

The tension in the string is

T = M(a+u_k*g)=19.8 N

Option E is correct