A block placed on a horizontal surface is being pushed by a force F making an angle 0 with the vertical. If the friction coefficient is u, how much force is needed to get the block just started. Discuss the situation when tane < H.
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- A skydiver with a mass of 50 kg has reached the typical terminal velocity of 30 m/s. The drag force from the air on this person is a non-conservative force, and therefore converts mechanical energy into thermal energy. Find the rate at which this is occurring for the skydiver.A ski starts from rest and slides down a 22-degree incline 75 m long. a) If the coefficient of friction is 0.090, what is the ski's speed at the base of the incline? b) If the snow is level at the foot of the incline and has the same coefficient of friction, how far will the ski travel along the level?What is the work done by the normal force if a 10 kg mass moves 10 m up an inclined plane with inclination angle 30 degrees, and a coefficient of kinetic friction of 0.5?
- If you have an object moving along a rough surface (one in which kinetic friction is a significant contributor) then kinetic energy will be conserved. True O FalsePlease ignore my last question. I am sorry. I messed up the problem when I asked before. The correct one is below: An inclined plane makes an angle of 30 degee with the horizontal. (Static friction coefficent of the inclined surface is 0.4 and the kinetic friction coefficent is 0.1) A block which weighs 1 kg must pass through a gate at the bottom of the incline with a velocity of 3.0 m/s. At what distance along the incline must you realease the block?A 4kg block was released from rest on top of a quarter circular surface. If the vertical height from A to B is given as 4m as shown below, How far from point B will the block reach if the surface A to B is frictionless while B to C has a coefficient of friction of 0.45? answer must be in meters.
- Calculate the work done (in J) on a 1550 kg elevator car by its cable to lift it 37.5 m at a constant speed, assuming friction averages 115 N. What is the total work done (in J) on the lift?A 5 kg block slides down a 9 m long incline that makes an angle of 55 degrees with the horizontal. The coefficient of kinetic friction between block and incline is 0.49. Calculate the work done by friction as the block slides. (Please answer to the fourth decimal place - i.e 14.3225)(a) Calculate the force needed to bring a 950 kg car to rest from a speed of 90.0 km/h in a distance of 110 m (a fairly typical distance for a nonpanic stop). (b) Suppose instead the car hits a concrete abutment at full speed and is brought to a stop in 2.00 m. Calculate the force exerted on the car.
- (a) Calculate the force needed to bring a 850 kg car to rest from a speed of 90.0 km/h in a distance of 105 m (a fairly typical distance for a nonpanic stop).N(b) Suppose instead the car hits a concrete abutment at full speed and is brought to a stop in 2.00 m. Calculate the force exerted on the car and compare it with the force found in part (a), i.e. find the ratio of the force in part(b) to the force in part(a).(force in part (b) / force in part (a))The speed of a crate traveling on a horizontal frictional surface changes from vi=13 m/s to vf=11.5 m/s in a distance of d=8.5 m. (A) how long in seconds did it take for the crate to slow by this amount, assuming the acceleration is constant? (B) if the crate has a mass of 1kg, what is the power supplied to the crate by friction? (C) what is the coefficient of kinetic friction between the crate and the surface uk?Thank you!