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A Carnot heat engine with an efficiency of 60% receives heat of 3000kj from a source and reject the waste heat to medium at 300k.Determine the source temperature
Two identical tiny metal balls have charges Q1 and Q2. The repulsive force one exerts on the other when they are 25 cm apart is 7.33 x 10^-4 N. After the balls are touched together and then separated again to 25 cm, the repulsive force is found to be 9.67 x 10^-4 N. What are the charges of Q1 and Q2
A spherical ball of plasma has a radius of 0.50 m. The electric field on the surface of the ball is measured to be 8.9 x 103 N/C and points radially inward toward the center. What is the value of the electric charge
Two identical conducting spherese are placed with their centers 45 cm apart one is given a charge of +12 x 10^-9 C and the other is given a charge of -18 x 10^-9 C. the spheres are connected by a conducting wire. After equilibrium has occurred, find the electric force between the two spheres
The parallel plates of an air capacitor are separated by 2.25 mm. Each plate carries a charge of 6.50 nC. The magnitude of the electric field of the plates is 4.75x10^5 V/m. Find the (a) potential difference between the plates, (b) capacitance, and (c) area of plate.
A 10-Newton object moves to the left at 1 m/s. Its kinetic energy is approximately _____ Joules.
a. 0.5
b. 1
c. 10
d. more than 10
A 100 kg block is pulled at a constant speed of 5 m/s across a horizontal force by an applied force of 122 N directed 37 o above the horizontal. The rate at which the force does work on the block is.
a. 810 Watts
b. 490 Watts
c. 530 Watts
d. 704 Watt
The average horsepower required to raise a 150 kg drum to a height of 20 m in a time of 1 minute is.
a. 0.5 Hp
b. 1 Hp
c. 0.7 Hp
d. 1.2 Hp
A worker pushes a wood crate of mass 14 kg across a concrete floor with a constant horizontal force of magnitude 40N. In a straight-line displacement of magnitude d= 0.50 m, the speed of the crate decreases from 0.60 m/s to 0.20 m/s.
Find the following:
a. Work done by the worker’s force.
b. Change in the kinetic energy of the crate.
c. Increase the thermal energy of the crate and the floor.
a wave travels in the x-direction its displacement y at point x in time t is y=0.1 sin (5x-6t) Its wavelength is? (a) π/5 (b) 2π/5 (c) π/2 (d) 5π/6 (e) 5π/3
