What is the angular velocity of the wheel at 5 s?

) A 4.0 cm tall candle flame is 2.0 m from a wall. You happen to have a lens with a focal length of 32 cm. How many places can you put the lens to form a well-focused image of... Read more

Problem 14.07 The Eiffel Tower in Paris is 984 ft tall and is made mostly of steel. Part A If this is its height in winter when its temperature is -8.00 ∘C, how much additional vertical distance must you cover... Read more

A person bending forward to lift a load "with his back" rather than "with his knees" can be injured by large forces exerted on the muscles and vertebrae. The spine pivots mainly at the fifth lumbar vertebra, with the principal... Read more

A box with mass m = 2.5 kg rests on the top of a table. The coefficient of static friction between the box and the table is μs = 0.61 and the coefficient of kinetic friction is μk = 0.32.... Read more

A. What is the magnitude of the electric field at the dot in the figure? B. What is the direction of the electric field at the dot in the figure? Choose best answer. (a) the negative x-axis. (b) the positive... Read more

The figure (Figure 1) shows voltage and current graphs for a resistor. I found part A , emf frequency = 25 Hz Part B What is the value of the resistance R? Part C Draw the resistor’s voltage and current... Read more

A cylindrical tungsten filament 14.0 cm long with a diameter of 1.30 mm is to be used in a machine for which the temperature will range from room temperature (20 ∘C) up to 120 ∘C. It will carry a current... Read more

The figure shows a light ray incident on a polished metal cylinder where h = R/6. At what angle θ will the ray be reflected? 1 Answer This is as much about geometry as physics. Draw a construction line from... Read more

In a hydroelectric dam, water falls 33.0m and then spins a turbine to generate electricity. A. What is delta U of 1.0 kg of water? B. Suppose the dam is 80% efficient at converting the water's potential energy to electrical... Read more

The free-fall acceleration at the surface of planet 1 is 22 m/s2. The radius and the mass of planet 2 are twice those of planet 1. What is the free-fall acceleration on planet 2? 1 Answer g1 = G M1/R1^2... Read more