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Calculate the percent error made over one mile of distance by the "5 second rule" for estimating the distance from a lightning strike for each of the following temperatures.
A 3.3 block of wood sits on a table. A 3.0 bullet, fired horizontally at a speed of 480 , goes completely through the block, emerging at a speed of 200. What is the speed of the block immediately a
A train at rest emits a sound at a frequency of 1045 Hz. An observer in a car travels away from the sound source at a speed of 37 m/s. What is the frequency heard by the observer?
A projectile is launched from the top of a cliff above level ground. At launch the projectile is 35 meters above the base of the cliff and has a velocity of 50 meters per second at an angle 37°
A ball in flight is recorded and analyzed using digital video analysis software. What should the result have been for the horizontal speed (Vx)?
A planetoid has a mass of 2.210e+21 kg and a radius of 7.00×105 m. Find the magnitude of the gravitational acceleration at the planetoid's surface.
A 28-{rm cm}-diameter vertical cylinder is sealed at the top by a frictionless 25 kg piston. The piston is 87 cm above the bottom when the gas temperature is 311^circ C. The air above the piston is
If, on the other hand, she first kicks it to player #2, who then kicks it into the net, the ball undergoes two successive displacements, y and x. What are the magnitude and direction of x and y?
A copper block is removed from a 300^0C oven and dropped into 1 L of water at 20.0^0 C. The water quickly reaches 25.5^0 C and then remains at that temperature. What is the mass of the copper block
The angular momentum of the electron as it moves around the center of the circle is 1.40 × 10-25J·s. Find the radius of the circular path.
A blue ball is thrown upward with an initial speed of 19.6 m/s, from a height of 0.5 meters above the ground. 2.4 seconds after the blue ball is thrown, a red ball is thrown down with an initial spe
A 15 g rifle bullet traveling 210 m/s buries itself in a 3.4 kg pendulum hanging on a 2.9 m long string, which makes the pendulum swing upward in an arc. Determine the vertical and horizontal compo
What coefficient of friction would be required to keep the crate moving at constant speed under the action of the 325n force?
A parallel-plate capacitor is formed from two 3.50 cm x 3.50 cm electrodes spaced 3.00 mm apart. The electric field strength inside the capacitor is 2.00 x 10^6 N/C. What is the charge (in nC) on ea
Your adventurous friend Lola goes bungee jumping. She leaps from a bridge that is 100m above a river. How fast is she falling when she just starts to stretch the cord? How long does it take for Lola t
You need to move a 125-kg sofa to a different location in the room. It takes a force of 94 N to start it moving. What is the coefficient of static friction between the sofa and the carpet?
If the block of mass m were replaced with a block four times more massive, by what factor would the period change? Would the period be longer or shorter?
A golf ball with an initial angle of 34° lands exactly 240 m down the range on a level course. Neglecting air friction, what initial speed would achieve this result?
As a result of a temperature rise of 32°C, a bar with a crack at its center buckles upward (see figure below). If the fixed distance L0 is 3.77 m and the coefficient of linear expansion of the b
The two cars have an elastic collision. Assume the surface is frictionless. What is the final velocity of car 1 in the ground (original) reference frame
The proton is projected perpendicularly toward the negative plate with an initial speed. The proton strikes the negative plate at the same instant that the electron strikes the positive plate. Igno
A Geiger counter registers a count rate of 4,000 counts per minute from a sample of a radioisotope. Twelve minutes later, the count rate is 1,000 counts per minute. What is the half-life of the rad
A simple harmonic oscillator consists of a block of mass 1.20 kg attached to a spring of spring constant 184 N/m. What is the amplitude of the oscillations?
A 80 kg skier skies down a 10 m tall slope with an incline of 20 degrees to the vertical. A horizontal headwind of 3N directly horizontal retards the skiers motion. Solve for the skier's velocity a
A vertical electric field of magnitude 3.00 multiplied by 104 N/C exists above the Earth's surface on a day when a thunderstorm is brewing. A car with a rectangular size of 6.00 m by 3.00 m is trav