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An object with a charge of -3.1 mu C and a mass of 1.7×10-2 kg experiences an upward electric force, due to a uniform electric field, equal in magnitude to its weight. Find the magnitude of t
The ball reaches a height 600 cm above the floor.What was the tension in the string an instant before it broke?
An image of the moon is focused onto a screen using a converging lens of focal length f= 34.3 cm. The diameter of the moon is 3.48×106 m, and its mean distance from the earth is 3.85×10
A train starts at rest at a station and accelerates at a rate of 2.0 m/s^2 for 20 seconds. Then, this train runs at a constant speed for 100 seconds and slows down at a rate of 5.0 m/s^s until it st
A major motor company displays a die-cast model of its first automobile, made from 9.35 kg of iron. To celebrate its one-hundredth year in business, a worker will recast the model in gold from the
The weight of passengers on a roller coaster increases by 59% as the car goes through a dip with a 36m radius of curvature. what is the car's speed at the bottom of the dip?
What is the thinnest soap film (excluding the case of zero thickness) that appears black when viewed by reflected light with a wavelength of 480 {rm nm}? The index of refraction of the film is 1.33
Rank these scenarios on the basis of the angle of the first interference maximum. Rank from largest to smallest. To rank items as equivalent, overlap them.
How high a tree would a 79.0 kg person have to climb to increase his gravitational potential energy relative to the ground by that amount?
What minimum horsepower must a motor have to be able to drag a 330 box along a level floor at a speed of 1.10 if the coefficient of friction is 0.50?
A 26-kg girl is bouncing on a trampoline. During a certain interval after leaving the surface of the trampoline, her kinetic energy decreases to 210 J from 430 J. How high does she rise during this
A proton orbits a long charged wire, making revolutions per second. The radius of the orbit is cm. What is the wire's linear charge density?
A charge of -4.0 nC is at the origin and a second charge of 14.0 nC is at x = 3.00 m. Find the magnitude and direction of the electric field halfway in between the two charges.
A model rocket is launched straight upward with an initial speed of 53.9 m/s. It accelerates with a constant upward acceleration of 1.82 m/s2 until its engines stop at an altitude of 159 m. What is
How many turns of wire would be on a solenoid carrying a current 4 A if the solenoid is 13 cm in diameter, 200 cm long, and the field at the center is 2.1 × 10-3 T .
A 10 meter object is placed at a distance of 175 meters in front of a lens whose focal length is 50 meters. Which of the following describes the image formed? (a) it is 4 meters long and inverted (
If you are in a car accident with an initial speed of 119 km/h and you are stopped by an airbag that inflates from the dashboard, over what distance must the airbag stop you for you to survive the c
A toy train is pushed forward and released at x_0=2.0;{rm m} with a speed of 2.0 {rm m/s}. It rolls at a steady speed for 2.0 {rm s}, then one wheel begins to stick. The train comes to a stop 6.0 {
Two blocks are placed in contact on a horizontal frictionless surface. The smaller box has less mass than the larger box. A force F is applied to the small box as shown so that the boxes accelerate
Compare with the strenght of the earth's gravity at its surface, how much weakeris gravity at a distance of 10 earth's center?
If the probe is to achieve a maximum distance of 8.0 106 m from the center of Zero, with what initial kinetic energy must it be launched from the surface of Zero?
A motorist drives south at 22.0 m/s for 3.00 min, then turns west and travels at 25.0 m/s for 2.40 min, and finally travels northwest at 30.0 m/s for 1.00 min. For this 6.40 min trip, find the follo
Why are you are not harmed with the contact of a charged metal ball, even though its voltage may be very high. Is the reason similar to why you are not harmed by the greater-than-10000 C sparks fro
A proton orbits a long charged wire, making 1.10 times 10^{6} revolutions per second. The radius of the orbit is 1.10 cm. What is the wire's linear charge density?
A block of mass m is suspended from a string a height h above the ground. The string is wrapped around a disk shaped pulley with mass m and radius R. Find the tension T in the string. (Your answer