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A copper bar 2.5 m long has a circular cross section of radius 2 cm. One end is kept at 80 oC and the other end is kept at 0 oC. The surface of the bar is insulated so that there is negligible heat
A capacitor is consists of two short sections of parallel wires in air. One wire is found to be of the voltage of 48 V and the other -48. They carry equal and opposite charge of magnitude 65 pC. Wha
Landing on the Moon, a spacecraft fires its rockets and comes to a complete stop just 16 meters above the lunar surface. (A) How long does it take to fall? (B) What is its impact speed?
Differentiate the position vector twice with respect to time to find the acceleration, and find its magnitude.
By how much does the ball clear or fall short of clearing the crossbar of the goalpost if that bar is 3.05 m high? (b) What is the vertical velocity of the ball at the time it reaches the goalpost?
A 14.0 gauge silver wire of diameter 1.628 carries a current of 13.0 . What is the potential difference across a 2.05 length of the wire?
Describe qualitatively what happens to the magnitude of the acceleration as the ball falls... does the acceleration increase, decrease, remain the same, decrease then increase, etc.? Please explain
If the battery is disconnected and then the plates are pulled apart to a separation of 1.40 , what is the capacitance (C), charge (Q), electric field between plates (E), and energy stored in the cap
What is the power dissipated in the heating element when the current reaches a steady value? What is the power dissipated in the heating element initially?
An object is moving in the -direction at 1.4 m/s when it undergoes an acceleration . a = 0.52j m/s^2 Find its velocity vector after 4.8. Express your answer as a comma-separated pair of components.
Two divers jump from a 5- platform. One jumps upward at 1.50 , and the second steps off the platform as the first passes it on the way down. Part A: What is the first diver's speed as he hits the wa
What are the strength and direction of the electric field at points 4, 8, and 12 cm from the center?
The dry weight of a man is 845 N. When he is submerged underwater, the reading on the scale is only 43.2 N. (a) What is the volume of the man?
The surface charge density on the inside surface is -300nC/m2. The surface charge density on the exterior surface is +300 nC/m2. What are the strength and direction of the electric field at points 4,
What is the angle between the board and the horizontal direction when the box begins to slide down the board?
A 7.0-kg block is at rest on a horizontal floor. If you push horizontally on the 7.0-kg block with a force of 21.0 N, it just starts to move. (a) What is the coefficient of static friction?
The dipole is held perpendicular to a uniform electric field with field strength 1040V/m , then released. What is the dipole's angular velocity at the instant it is aligned with the electric field?
A research submarine has a 40cm diameter window that is 8.2cm thick. The manufacturer says the window can withstand forces up to 1.1×10^6 N . What is the submarine's maximum safe depth in salt
I shoot a basketball at an angle of 65.0 degrees above the horizontal from a height of 2.00 m above the ?oor. the ball is shot at a speed of 9.70 m/s to the ball and the ball leaves my hand a horizo
Imagine a truck with a mass of 23 metric tons (t) (1 t=1,000 kg) barrelling down a highway at a speed of 55 mi/h. What is the truck's momentum in kilograms? What is its kinetic energy in kilograms?
A particle of charge of +4.50 10-6 C is 12.0 cm distant from a second particle of charge of -2.00 10-6 C. Calculate the magnitude of the electrostatic force between the particles.
A hollow metal sphere has 7cm and 11cm inner and outer radii, respectively. The surface charge density on the inside surface is -300nC/m^2. The surface charge density on the exterior surface is +30