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1. Mrs. Salcedo's car of mass 2.4 x 10³ kg travelling on the highway when the teacher receives an emergency call. She increased the speed of the car to 33 m/s.The increase in speed results in 3.1 x10^5 J of work done on the car. Determine the initial speed of the car in km/h.
1. Mrs. Salcedo's car of mass 2.4 x 10³ kg travelling on the highway when the teacher receives an emergency call. She increased the speed of the car to 33 m/s.The increase in speed results in 3.1 x10^5 J of work done on the car. Determine the initial speed of the car in km/h.
A 2.5 kg block is on a 53 degree inclined plane for which μk = 0.25 and μs = 0.5. Find its acceleration and its orientation knowing that :
a) it is initially at rest.
b) it moves up the slope.
c) it moves down the slope.
A person weighing 80 kg applies a horizontal force to a box weighing 20 kg to set it in motion. The person is μs = 0.8 and the box is μk =0.4.
a) Assuming the person remains stationary, what is the maximum possible acceleration of the box?
b) Use the answer to the previous question to determine the force exerted by the case on the person.
In a thermally insulated cylinder with an internal cross section S = 500 cm2 and a height l =
= 50 cm, there is a resistor with resistance R = 120 Ω. The cylinder is otherwise filled with air
at a temperature T0 = 20 ◦C and pressure p0 = 101 kPa, and the same kind of air surrounds
the cylinder. A current I = 200 mA flows through the resistor. A base of the cylinder breaks
away when pushed with a force exceeding F = 500 N. After what time does that happen?
What is the resistance of an electric frying pan that draws 60A when connected to a 220V circuit? Find the unknown R = ?
What is the kinetic energy of the continent?
What is the resistance of an electric frying pan that draws 60A when connected to a 220V circuit? Find the unknown R = ?
What is the resistance of a silver wire 25 m long at 20 °C and whose diameter is 0.00095 cm? the of silver is at 20 °C is 1.6 x 10-8Ω.m.
What is the magnitude of the force a 1.5 x 10-6C charge exerts on a 3.2 x 10 -4C charge located 2.5 m away?
