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A house painter stands 3 m above the ground on a 5.4-m-long ladder that leans against the wall at a point 4.7 m above the ground. The painter weighs 635 N and the ladder weighs 158 N. Assuming no friction between the house and the upper end of the ladder, find the force of friction that the driveway exerts on the bottom of the ladder.
A pump is required to lift a mass of 770 kg of water per minute from a well of depth 14.2 m and eject it with a speed of 17.5 m/s. How much kinetic energy does the pump give the ejected water
A +10 nC charge is placed on the x-axis at x= -6cm. A +8 nC charge is placed 14cm away on the x-axis at x= +8 cm. A) find the potential at the origin
An electron is moving in the +y direction at 4.7 x 105 m/s when it encounters a magnetic field of 2.5 T coming out of the page. What is the magnetic Force (FB) acting on the electron
A steel bridge is built in the summer when its temperature is 35.5oC. What is the length of the bridge on a cold winter day when its temperature is -11.5 oC
A childs toy consists of a spherical object of mass 50 attached to a spring. What is the potential energy of the toy when the spring is compressed 3.5 from its equilibrium position
A cylinder contains a mixture of helium and argon gas in equilibrium at a temperature of 247 ? C. Boltzmann's constant is 1.38066 × 10 ?23 J/K, What is the rms speed of argon
A race car rounds a curve at 53 m/s. The radius of the curve is 450 m, and the car's mass is 620 kg. What is the centripetal force acting on the car
a scientific instrument weighs 85.2 N in the Earth's surface and weighs 32.2 N in the surface of mercury. What is the acceleration of gravity on Mercury
A mass of 3.90 kg is suspended from a 1.55 m long string. It revolves in a horizontal circle. Calculate the angle between the string and the vertical
A bullet emerges from the muzzle of agun with a speed of 300m/s. calculate the time for the bullet to travel the lenght of the barrel, assuming the force is zero at the end of the barrel
Standing at a crosswalk, you hear a frequency of 500 Hz from a siren of an approaching ambulance. Determine the ambulance's speed from these observations
Two clocks are synchronized. One is placed in a race car that drives around a 2.0-km-diameter track at 130 m/s for 24 hours. by how much do the two clocks differ
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