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Q. A clerk moves a box of cans down an aisle by pulling on a strap attached to box. The clerk pulls with a force of 178 N at an angle of 24° with the horizontal. The box has the mass of 40 kg, and the coefficient of kinetic friction between box and floor is 0.45. Find out the acceleration of the box.
Q. Assume you are swimming in a river while a friend watches from the shore. In calm water, you swim at a speed of 1.25 m/s. The river has a current that runs at a speed of 1m/s. Note that speed is the magnitude of velocity vector. The velocity vector tells you both how fast something are moving and in which direction it is moving. If you are swimming upstream (i.e. against the current, at what speed does your friend on shore see you moving?
A spaceship is measured to be 120 m long while it is at rest with respect to an observer. If the spaceship now flies past the observer with a speed of .99c, what length would the observer measure of the spaceship.
An electric field of 7.85 10^5 V/m is desired between two parallel plates, each of area 42.0 cm2 and separated by 2.45 mm of air. What charge must be on each plate.
Find the force exerted by the plane on the pilot
For the polarisers, assume the incident light is linearly polarized, the transmitted intensity (through both polarisers) is 0.15×I0, and the axis of the second polarizer makes an angle θ=41° with the axis of the first polarizer. What is the angle (in..
A non-uniform bar 5 meters has a center of gravity 1 meters from the heavy end. If it is placed on the edge of a block 1 meters from the light end and a weight of 1497N is placed at the light end of the bar, it will be balanced. What is the weight..
what is the needed magnitude of the minimum acceleration.
A sled weighing 189N rests on a 15° incline, held in place by static friction. The coefficient of static friction is 0.50.
A wooden raft has a mass of 45 kg. When empty it floats in water (density 1000 kg/m3) with 68% of its volume submerged. What mass of sand could be put on the raft without it sinking.
What is the strength of the electric field.
Sunlight is used in a double-slit interference experiment. The fourth-order maximum for the wavelength of 470 nm occurs at an angle of θ = 90°. Thus, it is on the verge of being eliminated from the pattern since θ cannot exceed 90°.
An airoplane takeoff speed is 320km/h. if its average acceleration is 2.9m/s^2, how long is it on runway after starting its takeoff roll.
A 240g ball and a 130g ball are connected by a 32 cm-long massless, rigid rod. The structure rotates about its center of mass at 150rpm.
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