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The minimum distance required to stop a car moving at 46.0 mi/h is 50.0 ft. What is the minimum stopping distance for the same car moving at 73.0 mi/h, assuming the same rate of acceleration? &nbs
At which of the lettered points on the graph below: Is the motion slowest? Is the object speeding up? Is the object slowing down?
The coefficient of static friction between rubber car tires and dry concrete is 1.05. The maximum speed of a car in a level turn in dry weather is found to be 85.0 km/hr. What is the maximum speed
What is the difference in blood pressure () between the top of the head and bottom of the feet of a 1.68 tall person standing vertically?
An 81.0 spacewalking astronaut pushes off a 660 satellite, exerting a 110 force for the 0.450 it takes him to straighten his arms. How far apart are the astronaut and the satellite after 1.40 ?
First, what"s the AC line voltage (in the US)? Then, how much current to give 75W? (power = voltage x current) Finally, what"s the resistance?
Two small plastic spheres are given positive electrical charges. When they are a distance of 14.6 cm apart, the repulsive force between them has a magnitude of 0.200 N. What is the charge on each sp
A boat moves through a river at 7.0 m/s relative to the water, regardless of the boat's direction. If the water in the river is flowing at 3.5 m/s, how long does it take the boat to make a round tr
A canoe of mass 70 kg with a paddler of mass 55 kg are in a river. If the river's current exerts a force of 15 N [E] while the paddler is paddling with an average force of 22 N [N38degreesW], find
The other end is fixed in place. Initially, there is no tension in the wire. Find the tension when the tuning peg is turned through two turns.
A student who weighs 520 N is wearing a backpack that weighs 84 N. The student is standing still on level ground. Give your answers to the following questions in Newtons.
Determine the minimum diameter a steel wire can have if it is to support a 70 kg circus performer without its elastic limit being exceeded.
A thin-walled spherical shell is rolling on a surface. What fraction of its total kinetic energy is in the form of rotational kinetic energy about the center of mass?
A skater is gliding along the ice at 2.3 m/s, when she undergoes an acceleration of magnitude 1.2 meter per second square for 3.0 s. At the end of that time she is moving at 5.9 m/s. What must be t
(a) What is the acceleration of the three objects? (b) Find the tension in the string attached to the 25.0 kg object. (c) Find the tension in the string attached to the 10.0 kg object.
A spring whose stiffness is 1140 N/m has a relaxed length of 0.42 m. If the length of the spring changes from 0.27 m to 0.83 m, what is the change in the potential energy of the spring?
Jack and Jill ran up the hill at 3.4 m/s . The horizontal component of Jill's velocity vector was 2.3 m/s.
He sees the truck's headlights, and hears a 500 Hz horn. How rapidly is the truck approaching him, in m/s2? In mph?
A centrifuge in a medical laboratory rotates at an angular speed of 3,900 rpm. When switched off, it rotates 65 times before coming to rest. Find the constant angular acceleration of the centrifuge.
An air-track glider is attached to a spring. The glider is pulled to the right and released from rest at. It then oscillates with a period of 1.5 and a maximum speed of 32. What is the amplitude of
A 3000 pound car crashes into a concrete jersey barrier moving 3 sections (totaling 12,000 pounds) laterally 24 inches. How fast was the car going on impact?
A woman rides a carnival Ferris wheel at radius 16 m, completing 4.1 turns about its horizontal axis every minute. What are (a) the period of the motion, and the magnitude of her centripetal acceler
Take acceleration due to gravity to be 9.81 m/s^2. Use the work-energy theorem to calculate the minimum speed v that you must give the box at the bottom of the incline so that it will reach the skie
At what rate is the flywheel spinning when the power comes back on?
Estimate the energy dependence of the reading per unit exposure for LiF and CaF2 TLDs?