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Wally Whacko claims to have invented a heat engine that will revolutionize industry. It runs between a hot source at 300^\circ {\rm C} and a cold sink at 25^\circ {\rm C}. He claims that his engine
The current of 0.15 A flows through three resistors, R1 = 20 Ohm, R2 = 50 Ohm, R3 = 65 Ohm, connected in series. What is the power dissipated in the R2 resistor?
Now, you can spin the (roughly) triangular part around by twisting the straightened part between your fingers. Estimate the EMF that you can generate by spinning the hanger in the Earth's magnetic f
Take the example of a wire loop with a changing magnetic flux, and describe what would happen if current were induced opposite to the way it really is.
Charge of 5.00 x 10-9 C and a charge of -4.00 x 10-9 C are separated by a distance of 60.0 cm. Find the position at which a third charge, of 14.0 x 10-9 C, can be placed so that the net electrostatic
If only one particle is released from rest, while the other three remain stationary at the three other corners of the square, what is the final speed of the released particle once it is very far awa
Three point charges are on the x axis; q1 is at the origin, q2 is at x = 13.00 m, and q3 is at x = 26.00 m. (a) Find the potential at the point x = 0, y = 13.00 m if q1 = q2 = q3 = 3.10 µC. (b
Please present a "generic" estimate of this quantity that would show how this approximate value follows just from the fact that a crystal consists of atoms bound together by some sort of chemical bo
Suppose 1.0 mol of a monatomic ideal gas initially at 10 L and 330 K is heated at constant volume to 660 K, allowed to expand isothermally to its initial pressure, and finally compressed at constan
A 520 W Carnot engine operates between constant-temperature reservoirs at 109°C and 67°C. (a) What is the rate at which energy is taken in by the engine as heat?
A battery has an internal resistance of 1.3 Ω and a voltage of 48 V. What is the load resistance which causes the voltage to drop to 45.4 V?
When a 125-V emf is placed across two resistors in series, a current of 5.00 A is present in each of the resistors. When the same emf is placed across the same two resistors in parallel, the current
Two large, parallel, conducting plates are 12 cm apart and have charges of equal magnitude and opposite sign on their facing surfaces. An electrostatic force of 3.5 x 10-15 N acts on an electron pla
The mass of the ball is 2 kg while each piece of string is 125 cm long. The pole is 2 m high. The tension in the first (top) string is 80 N. A) Find the tension in the other string.
(a) the time constant of the circuit 2.1e-3 s (b) the maximum charge on the capacitor Your response differs from the correct answer by more than 10%. Double check your calculations. µC (c) the
You buy a plastic dart gun, and being a clever physics student you decide to do a quick calculation to find its maximum horizontal range. You shoot the gun straight up, and it takes 4.6s for the dar
A 0.1 g honeybee acquires a charge of 20 pC while flying. The electric field near the surface of the earth is typically 100 N/C , directed downward. What is the ratio of the electric force on the be
An object is hanging by a string from the ceiling of an elevator. The elevator is moving upward with a constant speed. What is the magnitude of the tension in the string? A)The magnitude of the tens
What is the angular separation between the red and violet components of the spectrum that emerges from the glass?
The core of an optical fiber has an index of refraction of 1.27, while the index of refraction of the cladding surrounding the core is 1.17. What is the critical angle for total internal reflection
Light rays in a material with index of refrection 1.31 can undergo total internal reflection when they strike the interface with another material at a critical angle of incidence. Find this material
A light beam is traveling through an unknown substance. When it exits that substance and goes into air, the angle of reflection is 33.0° and the angle of refraction is 50.0°. What is the in
You send a beam of light from a material with index of refraction 1.23 into an unkown material. In order to help identify this material, you determine its index of refraction by measuring the angles
A light ray propagates in a material with index of refraction 1.21, strikes an interface, and passes into a material whose index of refraction is 1.35. The angle of incidence at the interface is 42.
The ray from the laser strikes the mirror 35.5 cm from the wall, and the reflected ray strikes the wall 37.5 cm above the mirror. Find the angle of incidence of the laser ray on the mirror.