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Explosives are used to blow a rock apart. The explosion blows the rock into three fragments. Two fragments go off at a 104 degree angle to each other--a 5.3 kg piece at 34.1 m/s and a 6.2 kg piece a
what is the velocity vector of the twisted and mangled remains of the truck, which stuck together?
Calculate the final velocity of the baseball: A tennis ball (57 g) is rolling at a velocity of 5 m/s north. It collides with a baseball (142 g) that is initially at rest. The tennis ball bounces off
A solid sphere rolls up an incline plane. What is the direction of the frictional force at the point of contact. Next, If the sphere rolls down the plane what is the direction of the force at the po
Satellite with an orbital period of exactly 24.0 h is always positioned over the same spot on Earth. This is known as a geosynchronous orbit. Television, communication, and weather satellites use ge
Hearing damage may occur when a person is exposed to a sound intensity level of 90.0 dB (relative to the threshold of hearing) for a period of 9.0 hours. One particular eardrum has an area of 2.0 &t
A brick layer applies a force of 100 N to each of two handles of a wheelbarrow. Its mass is 20kg and it is loaded with 30 bricks,each of mass 1.5kg. The handles of the wheelbarrow are 30 degrees fro
What's the maximum speed the car can attain during this time? (The actual speed will be less, due to friction and other losses.)
Two charges of identical mass m, one with charge q, the other with charge 2q, hang from strings of length l from a common point. Assume q is sufficiently weak so that any angle is very small. Find a
A charge of 6.50 multiplied by 10-9 C and a charge of -2.50 multiplied by 10-9 C are separated by a distance of 60.0 cm. Find the position at which a third charge, of 10.0 multiplied by 10-9 C, can be
Three equal point charges, each with charge 1.75mC , are placed at the vertices of an equilateral triangle whose sides are of length 0.200m . What is the electric potential energy of the system?
A point charge with charge q1= 2.90 mC is held stationary at the origin. A second point charge with charge q2= -4.30 mC moves from the point (0.170m , 0) to the point (0.235m , 0.255m ). How much w
For the scanning electron microscope described above, find the electron's vertical displacement.
A particles have charges q1 = -q2 = 450 nC and q3 = -q4 = 95 nC, and distance a = 5.8 cm. What are the (a) x and (b) y components of the net electrostatic force on particle 3?
Electric bees. As they fly through the air, honeybees can pick up a small amount of electric charge. Suppose a 0.12-g bee acquires a charge of -60pC . How many excess electrons has the bee acquired?
A pair of speakers separated by 0.700 m are driven by the same oscillator at a frequency of 690 Hz. An observer originally positioned at one of the speakers begins to walk along a line perpendicula
A +15nC charge is located at (x,y)= (0cm,15cm) and a -7.0nC charge is located (x,y)= (7.0cm,0cm). Where would a -15nC charge need to be located in order that the electric field at the origin be zero
The acceleration of a particle is directly proportional to the square time t. When t = 0 the particle is at x = 24m. Knowing that t = 6s, x = 96m and v = 18m/s, express x and v in terms of t.
Assume that there are no frictional forces due to motion through the air in either case. Assume that your hand is does not jiggle in either case.
What is the speed of the elevator after it has moved downward 1.00m from the point where it first contacts aspring?
An electron (mass of 9.110 × 10-31kg and charge of -1.602 × 10-19C) is released at rest above the surface of the earth (where g = 9.81 m/s2). A second electron directly below it exerts an
A +2.0-nC point charge is placed at one corner of a square (1.5 m on a side), and a -3.0-nC charge is placed on a corner diagonally away from the first charge. What is the magnitude of the electric
A ring of charge with radius R = 3.5 m is centered on the origin in the x-y plane. A positive point charge is located at the following coordinates:
The tension in the rope is 140 N and the crate's coefficient of kinetic friction on the incline is 0.220. a) What is the work done by friction? b) What is the work done by the normal force?
(a) What was the speed (in m/s) of the wave? For reference, the speed of a 747 jetliner is about 250 m/s. Find the wave's (b) frequency and (c) period.