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Q. A small box is held in place against a rough vertical wall by someone pushing on it with a force directed upward at 27{rm ^circ} above the horizontal. The coefficients of static and kinetic friction between the box and wall are 0.40 and 0.30, respectively. The box slides down unless the applied force has magnitude 33 {rm N}.What is the mass of box?
Q. A woman rides a carnival Ferris wheel at radius 15 m, completing 5 turns about its horizontal axis every minute. What are (a) the period of the motion, and the magnitude of her centripetal acceleration at (b) the highest point and (c) the lowest point?
A projectile is launched from the top of a cliff above level ground. At launch the projectile is 35 meters above the base of the cliff and has the velocity of 50 meters per second at an angle 37° with horizontal. Air resistance is negligible.
The loaded cab of an elevator has a mass of 3.6 x 10^3 kg and moves 193m up the shaft in 20s at constant speed. At what average rate does the force from the cable do work on the cab.
In a television, electrons shoot down the picture tube and strike fluorescent material on the screen, causing light to be emitted and producing the picture. assume that a certain set, the electrons are accelerated from rest 2.0 x 10^8 ms-1 in abou..
A proton is initially at rest at a point where the potential is 515V. Sometime later the proton is at a point where the potential is 190V. If no force other than the electrostatic force acts on the proton, what is its final kinetic energy.
An aluminium block of mass m1 = 3.45 kg and a copper block of mass m2 = 6.30 kg are connected by a light string over a frictionless pulley. They sit on a steel surface, where θ = 40.0°
Calculate charges, current, potential difference.
A hawk flies in a horizontal arc of radius 14 m at a constant speed of 5 m/s. (a) Find out its centripetal acceleration. (b) It continues loftly along the same horizontal arc but increases its speed at the rate of 1 m/s2. Find out the acceleration..
A cube of ice is taken from the freezer at -8.0 and placed in a 113 aluminium calorimeter filled with 306 of water at room temperature of 20.0. The final situation is observed to be all water at 15.0.
A block of weight W can slide on a horizontal surface. A force of W/n1 is applied to the right that causes the block to accelerate with acceleration equal to g/n2. g is the acceleration by reason of gravity. If the coefficient of kinetic friction is ..
What is the y component (in Newtons) of F
As part of a safety investigation, two 1900 cars traveling at 25 are crashed into different barriers. Find out the average forces exerted on (a) car that hits a line of water barrels and takes 1.8 to stop, and (b) car that hits a concrete barrier an..
Assume a constant upward slope of 32; calculate the horizontal and vertical components of the acceleration of a truck that slowed from 140 to rest in 7.3.
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