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A car is moving down a street at 55 km/h. A child suddenly runs into the street. If it takes the driver 0.75 s to react and apply the brakes, how many meters will the hare have moved before it begins to slow down?
A conical pendulum is formed by attaching a 50 g mass to a 2 m string. The mass swings around a horizontal circle of radius 1 m. What is the acceleration of the mass
Light is shining perpendicularly on the surface of the earth with an intensity of 131 W/m2. determine the number of photons per second per square meter that reach the earth
A dockworker loading crates on a ship finds that a 18-kg crate, initially at rest on a horizontal surface, Find the coefficients of static and kinetic friction between crate and floor
A hydrogen atom is in the inital state ni = n, where n > 1. Find the frequency of the electron's orbital motion
A mass m is attached to an ideal cord of length L (figure at left). What is the tension in the cord at that moment
Describe the unique behavior of water (thermal expansion and specific heat capacity) that make it essential for life on Earth. 5-8 sentences
Find an expression for the loop's velocity as a function of time as it enters the magnetic field. You can ignore gravity, and you can assume that the back edge of the loop has not entered the field
A ball falls straight down onto a wedge that is sitting on frictionless ice. The ball has a mass of 3.27 kg, and the wedge has a mass of 5.31 kg. what is the velocity of the ball after the collision
A person 25 centimeters in front of a concave makeup mirror sees an upright image magnified by a factor of two. Draw a sketch to locate the image of the person
A hydrogen atom at rest makes a transition from the n=8 state to n=3. Find the wavelength of the emitted photon
The green block(B) has a mass of 10.00kg and is moving to the left at a speed of 3.70m/s. What should the velocity of the red block be in order to have the two blocks move to the right with a speed of 1.30 after the collision
A proton is at the origin and an electron is at the point x = 0.45nm , y = 0.35nm. Find the electric force on the proton
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