At a heighth metres above the des with a block of mass 2 kg which is stationary at point
The bob swings past A and comes to rest momentarily at a position h above the
ground.
The diagrams below are NOT drawn to scale.
Before
After
n
2 kg
۔
hy
12.
А
B
immediately after the collision the 2 kg block begins to move from A to B at a constant
speed of 4,95 ms
Ignore frictional effects and assume that no loss of mechanical energy occurs during the
collision
Calculate the:
1.1.1 Kinetic energy of the block immediately after the collision
(3)
112
want I want methods to calculate kinetic energy of the block immediately after the collision ​

An inclined plane wrapped around a metal shaft is a a. lever b. screw c. pulley d. wedge

Search coils and credit cards. one practical way to measure magnetic field strength uses a small, closely wound coil called a search coil. the coil is initially held with its plane perpendicular to a magnetic field. the coil is then either quickly rotated a quarter-turn about a diameter or quickly pulled out of the field. (a) derive the equation relating the total charge q that flows through a search coil to the magnetic-field magnitude b. the search coil has n turns, each with area a, and the flux through the coil is decreased from its initial maximum value to zero in a time ∆t. the resistance of the coil is r, and the total charge is q = i∆t, where i is the average current induced by the change in flux. (b) in a credit card reader, the magnetic strip on the back of a credit card is rapidly “swiped” past a coil within the reader. explain, using the same ideas that underlie the operation of a search coil, how the reader can decode the information stored in the pattern of magnetization on the strip. (c) is it necessary that the credit card be “swiped” through the reader at exactly the right speed? why or why not?

Arefrigerator uses r-134a as the working fluid and operates on the ideal vapor-compression refrigeration cycle except for the compression process. the refrigerant enters the evaporator at 120 kpa with a quality of 34 percent and leaves the compressor at 70°c. if the compressor consumes 450 w of power, determine (a) the mass flow rate of the refrigerant, (b) the condenser pressure, and (c) the cop of the refrigerator. (0.00644 kg/s, 800 kpa, 2.03)