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A rescue helicopter lifts a 85.3-kg person straight up by means of a cable. The person has an upward acceleration of 0.697 m/s2 and is lifted from rest through a distance of 13.8 m.
(a) What is the tension in the cable? How much work is done by
(b) the tension in the cable and
(c) the person's weight?
(d) Use the work-energy theorem and find the final speed of the person.
A very narrow hole is drilled all the way through the Earth (through its center) and evacuated (i.e. there is neither air resistance nor friction). A small object of mass m is dropped into the hole at the surface.
A particle with a charge of q = -5.60 nC is moving in a uniform magnetic field of B= (-1.23 T) z. Calculate the x component of the velocity of the particle
A car rounds a corner of radius 80 m at a speed of 20 m/s. What is the smallest value that the coefficient of static friction between the wheels and the road can have
A hanging mass, M1 = 0.18 kg, is attached by a light string that runs over a frictionless pulley to the front of a mass M2 = 0.36 kg that is initially at rest on a frictionless table. Find the tension in the string between masses
The magnitude of the electrostatic force between two identical ions of mass 4.760×10-26 kg that are separated by a distance of 8.20 nm is 1.682×10-10 N. What is the charge of each ion
What is a quantum well: give an example of structure, growth method to make quantum wells and quantum states i.e. outline quantization using diagrams
A tuning fork with a frequency of 440 Hz is held just above the top of a uniform glass tube containing water. What is the speed of sound in air
The minimum stopping distance for a car travelling at a speed of 30 {rm m/s} is 60 {rm m}, including the distance travelled during the driver's reaction time of 0.54 {rm s}.
A 124 balloon carrying a 22 basket is descending with a constant downward velocity of 25.2. A 1stone is thrown from the basket with an initial velocity of 19.9 perpendiculars to the path of the descending balloon.
find the tension in the wire.Find the maximum height above the ground reached by the package.
A mass of 1.7kg stretches a vertical spring 0.313 m. If the spring is stretched an additional 0.13m and released, how long does it take to reach (new) equilibrium position again.
Two charged bodies exert the force of 0.185N on each other. If they are moved so that they are one-fourth as far apart, what force is exerted.
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