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The edge of a cube consist of equal resistors of resistance R, which are joined at the orners, let a battery be connected to two opposite corners of a face of cube. what is the efective resistance?
What is the total mechanical energy present at the height given? What is its speed just as it left the ground? What is its maximum height?
A superconductor wire has a critical temperature of 90K. If the wire is at 77K, and an electromotive force of 6.0V is attached to the wire, how much energy is lost to heat per second if a current of
An aluminum nucleus has 13 protons and 14 neutrons. A copper nucleus has 29 protons and 34 neutrons. What is the force of repulsion between an aluminum nucleus and a copper nucleus when they are sep
Between flashes, the capacitor recharges through a resistor whose resistance is chosen so the capacitor recharges with a time constant of 3.0 s. Determine the value of the resistance.
A simple Atwood's machine uses two masses, m1 and m2. Starting from rest, the speed of the two masses is 9.0 m/s at the end of 9.0 s.
The two shells are fired at the same speed. Assume that air resistance is negligible and that the magnitude of the acceleration due to gravity is .
For two shells fired at the same speed which statement about the horizontal distance traveled is correct?
You are helping your friend prepare for her next skate board exhibition. For her program, she plans to take a running start and then jump onto her heavy-duty 15-lb stationary skateboard.
The terminal voltage of the battery is observed to be one-half the emf of the battery. How many bulbs are connected?
Two identical blocks made of extremely hard metal collide with equal and opposite velocities. Is such a collision closer to being completely inelastic?
A 24 kg block slides with an initial speed of 14 m/s up a ramp inclined at an angle of 25o with the horizontal. The coefficient of kinetic friction between the block and the ramp is 0.6. Use energy
Catching a wave, a 71 kg surfer starts with a speed of 1.3 m/s, drops through a height of 1.95 m, and ends with a speed of 8.2 m/s. How much nonconservative work was done on the surfer?
Two identifcal blocks with equal but opposite velocities collide and stick together. We know that they must be at rest after the collision. Why? What happened to their intial kinetic energy?
Two point charges are separated by 10.0 cm and have charges of +2.00 μC and -2.00 μC, respectively. Calculate the electric field at a point midway between the two charges. And calculate the el
The asteroid collides perfectly inelastically with the planet at its equator while traveling tangentially to the surface of the planet in the same direction as the velocity of the contact point on t
A series RC circuit has a time constant of 1.0 s. The battery has a voltage of 50 V and the maximum current just after closing the switch is 500 mA. The capacitor is initially uncharged. Calculate t
Two cylindrical resistors are made of the same material. The resistors, with resistance R1 and R2, have different radii, r1 and r2, and different lengths, L1 and L2. What is the relative values (r1/
If the size of the positive charge value is tripled for both of two point charges, to maintain the same mutual force between them what would be the ratio of old to new distance between the two point
Two forces FA and FB are applied to an object whose mass is 5.00 kg. The larger force is FA. When both forces point due east, the object's acceleration has a magnitude of 1.30 m/s2.
An electron is released from rest at the point midway between the two charges, and it moves along the line connecting the two charges. What is the speed (v final) of the electron when it is 10.0 cm
A beam of light in air is incident on the surface of a slab of fused quartz. part of the beam is transmitted into the quartz at an angle of refraction of 30 degrees relative to a normal to the surfa
A boat that can travel at 3.4km/h in still water crosses a river with a current of 1.9km/h. At what angle must the boat be pointed upstream to travel straight across the river?
It has been said that it is better to lift a weight "with your legs" instead of "with your back." Which method of lifting is more efficient? Explain your answer using anatomical and kinesiology prin
If i drop a rock off a cliff and it takes 4s before i see it hit the ground, A) how high is the cliff? B) How fast is the rock moving when it hits the ground?