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A boy stands at the peak of a hill which slopes downward uniformly at angle φ. At what angle θ from the horizontal should he throw a rock so that it has the greatest range?
A ball of mass 5.8 kg and radius 13 cm rolls without slipping horizontally at 5.6 m/s and hits a spring attached to a wall. What is the maximum change in length of the spring
If it starts 4.70m from the lower edge of the roof, how fast will the toolbox be moving just as it reaches the edge of the roof if the kinetic friction force on it is 21.0N
Describe the method used to measure the Sun's shadow and in the drawing on page 18 what are the letters b and d used for?
The atmosphere of the sun consists mostly of hydrogen atoms (not molecules) at a temperature of 6000 K. What are the average translational kinetic energy per atom
A sled slides without friction down a small, ice-covered hill. If the sled starts from rest at the top of the hill, its speed at the bottom is 7.50 m/s. What is the speed at the bottom of the hill
You are driving just behind a second car and both of you are moving at a speed 68. If you are very tired after a long night, or you are texting, or you are alcohol impaired, your reaction time can be twice your standard reaction time. What is the m..
A common flashlight bulb is rated at 0.300 A and 2.80 V (the values of the current and voltage under operating conditions). what is the temperature of the filament when the bulb is on
An 800-N man stands halfway up a 5 m long ladder of negligible weight. The base of the ladder is 3 m from the wall as shown. suppose that the wall-ladder contact is frictionless, wall pushes against the ladder with a force of what magnitude.
The yellow light from a helium discharge tube has a wavelength of 587.5 nm. Calculate the number of lines per centimeter on the grating
A 37-kg block of ice at 0° C is sliding on a horizontal surface. The initial speed of the ice is 6.2 m/s, Determine the mass of ice that melts into wate
An image projected on a screen is 9.1 cm high and is 6.4 cm from the lens. If the object that produces the image is 1.2 cm tall on the screen
One design challenge for a capacitor-powered electric car is that the voltage would change with time as the capacitors discharge. what fraction of energy would still be left
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