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A car with good tires on a dry road can decelerate at about 5.0 m/s2 when braking. Assume the car is initially traveling at 55 mi/h.
(a) Determine how much time does it take the car to stop?
(b) Determine what is the stopping distance?
A tennis racket has nylon strings. If one of the strings with a diameter of 1 mm is under the tension of 15 N, how much is it lengthened from its original lenght of 40 cm.
A 900N crate slides 12m down a ramp that makes an angle of 40 ? with the horizontal. how much thermal energy is created
An object suspended from a spring vibrates with simple harmonic motion. At an instant when the displacement of the object is equal to one-half the amplitude, what fraction of the total energy of the system is kinetic
A system of 1610 particles, each of which is either an electron or a proton, How many electrons are in this system
Two particles are fixed along a straight line, separated by a distance 4.2 cm. The left one has a charge +3.0 nC and the right one has a charge of +7.0 nC. What is the location of the point
The position of a particle as it moves along a y axis is given by y = (2.0 cm) sin (?t/4), What is the instantaneous acceleration of the particle at t = 0, 1.0, and 2.0 s
A student sits on a rotating stool holding two 2.0-kg objects. When his arms are extended horizontally, Find the new angular speed of the student
How many watts must a fluorescent bulb (25% efficiency) use to produce the same amount of light as a 100-watt incandescent bulb, What would the power consumption be for an LED
As seen from above, a playground carousel is rotating counterclockwise about its center on frictionless bearings. Find the final angular speed of the carousel after the person climbs aboard
A positron is a particle with the same mass and magnitude charge as an electron, but a positron has a positive charge. If a positron and electron are held a distance of 0.900 pm apart and then both are released from rest, when they are 0.324 pm away ..
A 0.223 kg ball is thrown straight up from 1.81 m above the ground. Its initial vertical speed is 8.40 m/s. A short time later, it hits the ground. Calculate the total work done by the force of gravity during that time.
a 9.0 ohm and a 6.0 ohm resistor are connected in series with a power supply. a the voltage drop across the 6.0 ohm
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