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Suppose you swing a ball attached to a string in a circle in a vertical plane, and energy is conserved (no friction, no external work). The tension in the string will vary through the swing. Find the difference between the tension when the ball is at the top of the circle and the tension when the ball is at the bottom.
A proton has a speed of 0.80c.Calculate the rest energy of the proton. Calculate the total energy of the proton
In the surface of a calm lake you see the image of a tree of height 25 m. The tree is on the opposite shore, 65 m away. How far is the image of the treetop from your eye
If a person does 80J of work in moving a 30 kg box over a 20m distance on a horizontal surface, What is the minimum force required
A small, spherical bead of mass 3.05 g is released from rest at t = 0 in a bottle of liquid shampoo. The terminal speed is observed to be vT = 1.80 cm/s. Find the value of the resistive force when the bead reaches terminal speed
The electron drift speed is 2.3 x 10-4 m/s in a metal with a mean free time between collisions of 6.0 x 10-14s. What is the electric field strength
Four point charges have equal magnitudes. Three are positive, and one is negative, find the ratio of the largest to the smallest net force magnitude
A 7.50 nC charge is located 1.80 m from a 4.20 nC charge. (a)Find the magnitude of the electric force that one particle exerts on the other. (b) Is the force attractive or repulsive?
The wings on a stonefly do not flap, and thus the insect cannot fly. However, when the insect is on a water surface, What is the ratio of the sailing speed vs to the average non-sailing speed vns
An object is placed 39cm from a certain mirror. The image is half the size of the object, inverted, and real. How far is the image from the mirror
Consider a long, straight horizontal wire, with a current moving to the east. What is the direction of the magnetic field created by this wire at a point directly above the wire
a parallel-plate capacitor has plates separated by 0.76 mmpart a if the electric field between the plates has a
The position versus time graph for a red blood cell leaving the heart is shown in the figure below. Determine the instantaneous velocity of the red blood cell when t = 13 ms. Recall, 1 ms = 0.001 s, 1 mm = 0.001 m. 1 m/s
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