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In the figure, a 4.4 kg block slides along a track from one level to a higher level after passing through an intermediate valley. The track is frictionless until the block reaches the higher level. There a frictional force stops the block in a distance d. The block's initial speed is v0 = 7.3 m/s, the height difference is h = 1.1 m, and μk= 0.632. Find d.
The tolerance is +-1 in the 3rd significant digit
In the figure, two blocks are connected over a pulley. The mass of block A is 11.0 kg and the coefficient of kinetic friction between A and the incline is 0.300. Angle θ of the incline is 43.0°. Block A slides down the incline at constant speed. What is the mass of block B?
The tolerance is +-1 in the 3rd significant digit.
A soccer ball is kicked from the ground with an initial speed of 19.2 m/s at an upward angle of 44.7˚. A player 50.1 m away in the direction of the kick starts running to meet the ball at that instant. What must be his average speed if he is to meet the ball just before it hits the ground? Neglect air resistance.Use g=9.81 m/s2
The tolerance is +-1 in the 3rd significant digit,
- Using mass (M), length (L), time (T) and current (A) as fundamental quantities, the dimensions of permeability are
1. Calculate the work done by a 2.0-N force (directed at a 80° angle to the vertical) to move a 500 gram box a horizontal distance of 500 cm across a rough floor at a constant speed of 0.8 m/s. Be cautious with the units. Show your solution.
2. Mrs. Salcedo's car of mass 2.4 x 10³ kg travelling on the highway when the teacher receives an emergency call. She increased the speed of the car to 33 m/s. The increase in speed results in 3.1 x10³ J of work done on the car. Determine the initial speed of the car in km/h.
3. A 80.0-kg person jumps onto the floor from a height of 5.00 m. If he lands stiffly (with his knee joints compressing by 0.500 cm), calculate the force on the knee joints.
A football is moving upwards towards its peak after having been booted by the punter. Neglect air resistance. Diagram the forces upon the football as it rises upward towards its peak.
An aluminum sphere has a diameter of 15.6 cm. What is its mass? (Refer to the table in the densities of common substances for aluminum)
What do you mean by the Young’s modulus for steel is 𝒀 = 𝟐. 𝟎 × 𝟏𝟎𝟏𝟏 𝑵𝒎−𝟐
? Explain
briefly
Mr. Ampere, of weight 680 N, was contacted to install wireless security cameras at a very busy shop. The ladder he used was 4.5 m long and its mass was 5 kg. It took him 18 s to reach the roof top of the shop is 4 m high. What would be Mr Ampere average power output
A boy weight 500N sitting on a see-saw. He sits 2.0 m from the pivot. What is the force (F) needed to balance the see-saw?
