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A system is acted on by its surroundings in a way that it receives 50 J of heat while simultaneously doing 20 J of work. What is its net change in internal energy? Show Work!
Kathy places one end of a copper rod in heat reservoir and the other end in a heat sink. By what factor is the rate of heat flow changed when the temperature difference between the reservoir and sin
A 10 g piece of aluminum (which has a specific heat of 0.215 cal/gm-C0) is warmed so that its temperature increases by 5C0. How much heat was transferred into it? Show Work!
Which best describes the relationship between two systems in thermal equilibrium?
A conducting sheet carries a surface current density of K (Amperes/meter). There are no other currents in the vicinity. a-) Find magnitude of B close to the sheet
A billiard ball collides in an elastic head-on collision with a second identical ball. What is the kinetic energy of the system after the collision compared to that before collision?
Write the Maxwell's equations in full form (with time varying fields) assuming magnetic monopoles do exist in the universe. And comment on subsequent changes of each equation.
A 75 kg swimmer dives horizontally off a 500 kg raft. If the diver's speed immediately after leaving the raft is 4 m/s, what is the corresponding raft speed? Show Work!
A 2500-kg truck moving at 10 m/s strikes a car waiting at a traffic light, hooking bumpers. The two continue to move together at 7 m/s. What was the mass of the truck car? Show Work!
A ball is thrown upwards with an initial velocity of 10 m/s. Find the time for its maximum height and also find its maximum height.
A curling stone, with a mass of 20.0 kg, slides across the ice at 1.50 m/s. It collides head on with a stationary 0.160-kg hockey puck. After the collision, the puck's speed is 2.50 m/s. What is th
Macie pulls a 40 kg rolling trunk by a strap angled at 30° from the horizontal. She pulls with a force of 40 N, and there is a 30 N rolling friction force acting on trunk. What is the trunk's ac
A 40-car train travels along a straight track at 40 mph. A skier speeds up as she skis downhill. On which is the net force greater?
An object, when pushed with a net force F, has an acceleration of 2 m/s2. Now twice the force is applied to an object that has four times the mass. Its acceleration will be. Show work please
A light ray can change direction when going from one material into another. This phenomenon is known as...
A star has an apparent magnitude of -1.5 and an absolute magnitude of 1.4 (giving it an m-M value of -2.9). If the value of the extinction towards the star Av is on the order of 0.5 magnitudes, what
A 10-cm-diameter parallel-plate capacitor has a 1.0 mm spacing. The electric field between the plates is increasing at the rate 1.3 106 V/(m · s). What is the magnetic field strength at the
A particle is trapped in an infinite square well in the first excited state . A) what is the wavefunction of the particle
A muon and an antimuon are moving in opposite directions with velocities of -0.6 c and 0.6 c, respectively. When they collide, they can annihilate each other and turn into two photons. Both muon and
Consider a Hydrogen atom with the electron in the n = 6 shell. What is the energy of this system? (The magnitude of the ground state energy of the Hydrogen atom is 13.6 eV.) How many subshells are i
Given that one solar mass is 2.0×1030 kg, what would be the radius of a Black Hole containing this amount of mass? (Just an interesting note: the average radius of the orbit of Mercury from th
An atom is ionized so that it has only one electron. When the electron drops from the n = 4 shell to the n = 1 shell, an X-ray of wavelength 243.14 pm is emitted. What is the atomic number?
A sound level meter located 8.92m from the explosion records a level of 110.dB during a time interval equal to the duration of the explosion. How long did the explosion last?
Tennis balls, to be acceptable for tournament play, must have a mass of 57.5 g. When dropped from a height of 2.5 m onto a concrete surface, a ball must rebound to a height of 1.4 m. During impact,