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Name the principle that accounts for the change in pitch as the train approaches and departs the crossing and explain how the principle works.
An electric heater plugged into a 115-V AC outlet uses an average electric power of 1200 W. What are the maximum instantaneous power and the minimum instantaneous power?
Question: A projectile is fired directly upward at such an initial velocity that it reaches half its height of 45 meters. Calculate its speed at the following intervals: Determine the speed of the p
According to the lorentz transformation equations, what are the x' and t' coordinates of this event as observed in the reference frame of a spaceship traveling in the x direction at a speed of .5c
If the distance between two objects is doubled, by how much should the mass of the first object increase, assuming the mass of the second is a constant, to maintain the same gravitational attraction
An astronaut on a distant planet notices that it takes 8 seconds for an object to drop 32 meters beginning from a resting position. Determine the magnitude of the acceleration due to gravity on the
What is the magnitude and direction of the impulse imparted by the floor to the ball?
A pendulum has a length of 0.3 meter and the acceleration of gravity is 9.8 m/s squared. Use the formula T = 2p vl/g to find the following values: the period of the pendulum
If the linear coefficient of expansion of the wood is 6.0 x10-5(C°)-1, at what temperature would the door begin to touch the side of the doorway?
The distance between two successive maxima of a transverse wave is 1.20m. Eight crests, or maxima, pass a given point along the direction of travel every 12.0s. Calculate the wave speed.
A car with a total mass of 1.92*10^3 kg has wheels of radius 31.0 cm and moment of inertia 0.830 kg · m2. What is the car's translational kinetic and rotational energy when the car is moving at
Find the energy stored in the inductor when the current reaches its maximum value. Find the energy stored in the inductor one time constant after the switch is closed.
A spring has a spring constant of k = 7.500N/m. If the spring is displaced 0.5500 from its equilibrium position, what is the force that the spring exerts?
An old professor uses a converging lens with focal length 28 cm to view a coin 16 cm in front of the lens. What is the magnification?
How far from a 51.4 mm focal-length lens must an object be placed if its image is to be magnified 2.50 and be real?
If you pass current through a standard coiled spring, what happens to the spring? Will it expand as if pulled, contract as if compressed, or remain in its given state?
What fraction of the power radiated by the sun is intercepted by the planet Mercury? The radius of Mercury is 2.44 x 106 m, and its distance from the sun at the moment is 5.80 x 1010 m. Assume that th
Assume the density of air is 1.29 kg/m3 and the density of helium is 0.179 kg/m3. Draw a force diagram for the balloon.
A 1.60 kg mass is attached to a light cord that is wrapped around a pulley of radius 6.80 cm, which turns with negligible friction. The mass falls at a constant acceleration of 2.25 m/s2. Find the m
A proton is released from rest in a uniform electric field of magnitude 385 N/C. Find (a) the electric force on the proton, (b) the acceleration of the proton, and (c) the distance it travels in
A 2.1 kg body oscillates in SHM on a spring that, when extended 2.3 mm from its equilibrium position, has an 10 N restoring force. What are (a) the angular frequency of oscillation, (b) the period o
What are (a) the angular frequency of oscillation, (b) the period of oscillation (in ms), and (c) the capacitance of an LC circuit with the same period if L is 7.5 H?
The block swings ina n arc, rising 8 mm above its lowest point. What is the kinetic energy of the bullet just before it hits the block?
The secondary voltage of an ignition transformer in a furnace is 14.5 kV. When the primary operates at an rms voltage of 100 V, the primary impedance is 23.3 O and the transformer is 91.9% efficient
If it is traveling north at 34 m/s through a magnetic field with vertical component of 30 µT, what magnitude emf is induced between the driver and passenger sides of the truck?