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A 7 ohm resistor is mounted in parallel with a resistor R=5 ohms, and this combination is connected in series with an 8 ohm resistor and a 12 volts battery. What is the current through the R resisto
What is the relative fraction of H atoms that are ionized in stars with surface T=5800K and 11300K (the atmospheres were assumed to have the same pressure P=200 dynes per cm^2). a. Find the relativ
An infinitely long line of charge has a linear charge density of 6.00×10-12 C/m . A proton is at distance 14.0 cm from the line and is moving directly toward the line with speed 2100 m/s. How cl
Only two horizontal forces act on a 3.0 kg body that can move over a frictionless floor. One force is 9.0 N due east, and the other is 8.0 N, acting 62° north of west. What is the magnitude of
Assuming all the initial kinetic energy is converted to heat energy and all this energy stays in the block, what is the final temperature?
In the adjoining bike lane, a cyclist speeds up from rest to 24.0 mi/h with constant acceleration 12.00 mi/h-s. Each vehicle maintains constant velocity after reaching its cruising speed. (a) For w
(a) What is the frequency of the alternating current? (b) Determine the resistance of the bulb's filament. (c) What is the average power delivered to the light bulb?
At that point its engines fail, and the rocket goes into free fall, with an acceleration of -9.80 m/s2. (You will need to consider the motion while the engine is operating separate from the free-fa
An 84-O resistor and a 74-O resistor are connected in series across a battery. The voltage across the 84-O resistor is 34 V. What is the voltage across the 74-O resistor?
Raindrops are falling straight downward.When observed from a car traveling at 55mi/h,the drops strike the side window at an angle of 60(degree) with vertical. Find the speed with which the drops are
If the acceleration of gravity on Mars is 1/3 that on Earth, how many times longer does it take for a rock to drop the same distance on Mars? If the gravitational acceleration on the moon is 1/6th o
What must the sign and magnitude of q2 be for the net electric field at the origin to be 50.0 N/C in the +x-direction?
What is the length of a simple pendulum that has this same period?
(a) What supports a white dwarf from further collapse? (b) Why can't a white dwarf have mass greater than 1.4M? (c) What supports a neutron star from collapsing under its own weight? (d) What will h
Estimate the rate at which the matter falls into the Cygnus A's supermassive black hole. Express your answer as the number of solar masses per century.
You have a baseball bat and a driver (golf club). Which one is the more efficient implement to strike the ball used in the sport? Explain your choice using the concepts of center of gravity, lever a
A golfer strikes a ball so that it flies a distance d away, landing a height h above its original elevation. The time of flight of the ball is T. a) Find the initial vertical component of the veloci
If electricity costs $0.07/kWh, how much will it cost to raise the temperature of the water from 70 to 120 F?
One pound-mass of air is heated at constant pressure from 300°F to 1300°F. Calculate the required thermal energy input if:
A 1500-kg automobile is pulled behind a tow truck. The power exerted by the tow truck on the car is a constant 50 kW. Determine the time required to accelerate the automobile from rest to a speed of
A closed system undergoes a cycle consisting of two processes. During the first process, 40 Btu of heat is transferred to the system while the system does 60 Btu of work. During the second process,
Assuming that temperature remains constant and that the air behaves as an ideal gas, what is the final volume? What is the work done by the air on the piston?
Find an expression for the oscillation frequency of an electric dipole of dipole moment P and rotational inertia I for small amplitudes of oscillation about its equilibrium position in a uniform ele
A 5.5cm -thick layer of oil (n=1.46) is sandwiched between a 1.1cm -thick sheet of glass and a 2.3 cm-thick sheet of polystyrene plastic (n=1.59). How long (in ns) does it take light incident perpen
A skier is gliding along at 4.0 m/s on horizontal, frictionless snow. He suddenly starts down a 14° incline. His speed at the bottom is 15 m/s. (a) What is the length of the incline?