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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.
During the Physics lab, Jerome runs up the stairs, elevating his 102 kg body a vertical distance of 2.29 meters in a time of 1.32 seconds at a constant speed.
a. Determine the work done by Jerome in climbing the staircase.
b. Determine the power generated by Jerome.
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
A balloon is rising vertically upward with a uniform
velocity 'u' as shown in Fig. 11.E22. At a certain
instant, a ball No. 1 is dropped from it, which takes a
4 sec to reach the ground. The moment this ball
strikes the ground, another ball is dropped from the
balloon and this 2nd ball takes 5 sec to reach the
ground. Find the velocity of the balloon 'u' and height
from which both the balls must have been dropped.
a conducting cylinder of radius 3.25 cm and length 5.6 cm has a total charge of 4.5 x 10 c distributed uniformly on its surface area. find the potential at a) its surface, and b) 2.5 cm and c) 5.0 cm from the center of the cylinder.
A turtle crawls along a straight line, which we will call the x-axis with the
positive direction to the right. The equation for the turtle’s position as a function of time is x(t) = 51.0 cm +
(2.50 cms) t − (0.0623 cms2) t2
a.)At what time t is the velocity of the turtle zero?
(b) How long after starting does it take the turtle to return to its starting point?
(c) At what times t is the turtle a distance of 0.1 m from its starting point? What is the velocity (magnitude and direction) of the turtle at each of these times?
