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A driver in a moving car applies the brakes. The car slows to a final speed of 2.95 m/s over a distance of 40.0 m and a time interval of 7.05 s. The acceleration while braking is approximately constant.
(a) What is the car's original speed before braking? m/s
(b) What is its acceleration during this time? (The car's initial velocity is in the positive direction. Indicate the direction with the sign of your answer.) m/s2
An electron is accelerated to speed of 1.5*10^8 m/s. at that speed, compare the relativistic results to classical results for , find the electron rest energy according to the relativistic laws
suppose that all the energy goes into the arrow, with what speed does the arrow leave the bow.
Consider neon, a noble gas whose molecules consist of single atoms of atomic mass 0.02 kg/mol. Avogadro's number is 6.02 × 1023 mol-1, what is the average kinetic energy of a neon atom
Three charges are located at 100-m intervals along a horizontal line: a charge of -3.0 C on the left, 2.0 C in the middle, and 1.0 C on the right. What is the electric field on the horizontal line halfway between the -3.0 C and 2.0 C charges
Create the magnitude of the net gravitational force on moon
A 37.0 kg child runs with a speed of 2.50 m/s tangential to the rim of a stationary merry-go-round, Calculate the initial kinetic energy of the system
A body oscillates with simple harmonic motion according to x = (12.5 m) cos[(2.0pirad/s)t + pi/3 rad]. What is the phase of the motion
a 45.7 kg girl is standing on a plank that has a mass of 152 kg. the plank originally at rest is free to slide on a
On a cool morning, when the temperature is 14 degrees C, you measure the pressure in your car tires to be 30 psi. After driving 50 mi on the freeway, temperature of your tires is 52 degrees C.
How much work should be done to bring 3 electrons from a great distance apart to within 2.55E-10 m from one another (at the corners of an equilateral triangle).
A typical photovoltaic cell delivers 4.2×10-3 W of electric energy when illuminated with 0.12 W of light energy. What is the efficiency of the cell? An "energy bar" contains 27 g of carbohydrates. If the energy bar was his only fuel, how far could..
You are looking in the directly into one end of a long solenoid. The magnetic field at its center points at you. What is the direction of the current in the solenoid
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