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What is the instantaneous power (in W) that you are supplying 2 seconds after you start pushing?
An electric device, which heats water by immersing a resistance wire in the water, generaters 50 cal of heat per second when an electric potential difference of 12V is placed across its leads. What
The leaf then floats down the river at 3ms-1 FOR 20 seconds until it gets caught on a rock. How far and in what direction from the base of the tree is the rock?
The Earth has an angular speed of 7.272·10-5 rad/s in its rotation. Find the new angular speed if an asteroid (m = 1.89·1022 kg) hits the Earth while traveling at a speed of 3.07&middo
How much work would be done in stretching the spring from 10.0 cm to 15.0 cm?
A series RLC circuit consists of a 809 W resistor, a 0.176 H inductor, and a 55.5 mF capacitor. It is attached to a 120 V/60 Hz power line. What is the peak current in A, the phase angle, (in deg) a
Consider the motion of an apple and the Earth as the apple falls to the ground. If the apple begins at the top of a tree of height 11 m, how much does the Earth move? Estimate the mass of an apple.
Two ideal inductors (0.124 H, 0.433 H) are connected in series to an AC voltage source with amplitude 5.17 V and frequency 113 Hz. a) What is the peak voltage across the 0.124 H inductor?
A 16.9-mH inductor, with internal resistance of 20.9 ? , is connected to a 110-V rms source. If the average power dissipated in the circuit is 48.2 W, what is the frequency? (Model the inductor as a
If you wanted to increase the separation between the bright fringes in the diffraction pattern formed by a diffraction grating, which of the changes could you make:
An object attached to a spring exhibits simple harmonic motion with an amplitude of 10.0cm. How far from equilibrium will the object be when the system's potential energy is equal to its kinetic ene
The current flowing in a solenoid that is 20.1 cm long and has a radius of 2.80 cm and 524 turns decreases from 3.31 A to 1.27 A in 0.220 s. Determine the magnitude of the induced electric field ins
A proton is accelerated through a potential difference of 150V. It then enters a region of Uniform magnetic field and moves in a circular path (radius = 12cm). What is the magnitude of the magnetic
Suppose you have a near-point distance of 16 cm. The angular resolution of the eye is determined by diffraction (see the Rayleigh criterion) and is approximately 2 arcmin. (Note that 1°=60 arcmi
A rectangular loop of wire of 6.6 cm by 8.0 cm in a uniform magnetic field of magnitude 1.6T. The loop is rotated from a position of zero magnetic flux to a position of maximum flux in 20ms. What is
A "195-watt" light bulb uses an average power of 195 W when connected to an rms voltage of 120 V. (a) What is the resistance of the light bulb?
A weather balloon is designed to expand to a maximum radius of17m at its working altitude, where the air pressure is 0.030 atm and the temperature is 200 K. If the balloon is filled at atmospheric p
They count 15 crests that pass by the raft in 19 s. How fast are the waves moving?
A phone cord is 3.08 m long. The cord hasa mass of 0.193 kg. A transverse wave pulse is produced by plucking one end of the taut cord. The pulse makes four trips down and back along the cord in 0.8
The shells fired form an artillery piece have a muzzle speed of 150 m/s, and the target is at a horizontal distance of 2.00 km. (a) At what angle relative to the horizontal should the gun be aimed?
The equation for the frequency f of oscillation of simple pendulum is f = 1/2p *vg/L, Where L is the length of the pendulum string and g is the acceleration due to gravity. Frequency is commonly exp
Can a photon and an electron of the same momentum have the same wavelengths? Calculate their wavelengths if the two have the same energy.
How much work must the spacecraft engines perform to move the spacecraft to a circular orbit that is 4480 km above the surface?
The force (but not the power) required to tow a boat at constant velocity is proportional to the speed. If a speed of 3.3 km/h requires 6.6 kW, how much power (in kilowatts, kW) does a speed of 8.8
An object is in front of a converging lens (f = 0.40 m). The magnification of the lens is m = 2.1. Relative to the lens, through what distance should the object be moved so that the magnification ch