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calculate the following (a) the work done by this force on the particle J (b) the change in the potential energy of the system J (c) the kinetic energy the particle has at x = 4.90 m if its speed is
What is its kinetic energy at this moment? Find the net work done on the object if its velocity changes to (8.00i + 4.00 j) m/s.
Find its spring constant. The load and the spring are taken down. Two people pull in opposite directions on the ends of the spring, each with a force of 185 N. Find the length of the spring in this
Assume you pay $0.10 per kW-hour for electricity. How much would it cost just to keep the hot water inside the heater for one week? The Joules are 6.87 *10^12.
Question: Calculate the change in the amount of bremsstrahlung that would be produced if an aluminum target were substituted for an iron target. Please show your work. Please show your work.
Question: What percentage of a photon beam would interact in passing through a 3-mm slice of absorber if the linear attenuation coefficient were 0.15/cm? Please show your work.
A 1.0 x 10-9 C charge is at the origin, and a -1.00 x 10-9 C charge is 4.1 m to the right on the positive x-axis. The electric potential is -1.4 V at a point on the x-axis that is a distance d to th
In 1910 Rutherford performed a classic experiment in which he directed a beam of alpha particles at a thin gold foil. He unexpectedly observed a few of the particles scattered almost directly backwa
An electron is initially at rest just outside a large copper surface that has a charge density of 1.04 x 10-6 C/m2. How far has the electron moved in 1.12 x 10-9 s if the field is uniform over this re
The combined mass of the girl and the sled is 56.0 kg, and the coefficient of kinetic friction between the snow and the runners of the sled is 0.106. How much time is required for the sled to travel
A thin gold ring of radius 1.02 cm carries a uniform charge per unit length of 1.02e-14 C/m. Find the electric field on the axis of the ring 1.09 cm from the center.
The left section of the wire makes an angle of 14.2° relative to the horizontal and sustains a tension of 476 N. Find the (a) magnitude and (b) direction (as an angle relative to horizontal) of
A model rocket blasts off from the ground, rising straight upward with a constant acceleration that has a magnitude of 88.8 m/s2 for 1.58 seconds, at which point its fuel abruptly runs out. Air resis
A 2.70-kg ball, moving to the right at a velocity of +3.39 m/s on a frictionless table, collides head-on with a stationary 7.10-kg ball. Find the final velocities
One object is at rest, and another is moving. The two collide in a one-dimensional, completely inelastic collision. In other words, they stick together after the collision and move off with a common
A golf ball strikes a hard, smooth floor at an angle of 22.1 ° and, as the drawing shows, rebounds at the same angle. The mass of the ball is 0.0342 kg, and its speed is 47.5 m/s just before and
The cheetah is one of the fastest accelerating animals, for it can go from rest to 32.3 m/s in 3.52 s. If its mass is 120 kg, determine the average power developed by the cheetah during the accelera
When the toaster reaches its final operating temperature, the current has dropped to 1.53 A. (a) Find the power the toaster converts when it is at its operating temperature.
The Earth has a mass of 5.98 1024 kg. The average mass of the atoms that make up the Earth is about 40 u. Based on this average mass, how many atoms are in the Earth? ________ atoms
An airplane is flying at v=100m/s along the straight line at an altitude h=5000m. At the instant when it is over an anti-aircraft battery, a rocket is fired at 500m/s to bring the plane down. A. Fi
A train is traveling at 30.0 relative to the ground in still air. The frequency of the note emitted by the train whistle is 262 . The speed of sound in air should be taken as 344 . What frequency is
The water gradually descends 7 m as the pipe increases in area to 8.2 cm2. (a) What is the speed at the lower level? 2.46m/s (b) If the pressure at the upper level is 2.0x10^5Pa, what is the pressur
Question: An object weighing 335 N in air is immersed in water after being tied to a string connected to a balance. The scale now reads 265 N. Immersed in oil, the object weighs 285 N. (a) Find the
An empty rubber balloon has a mass of 0.0115 kg. The balloon is filled with helium at a density of 0.181 kg/m3. At this density the balloon is spherical with a radius of 0.400 m. If the filled ballo