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Q. A person pulls on a 50kg desk with a 200 N force acting at a 30 degree angle above the horizontal. The desk does not budge.
Depict a force diagram for the desk.
a. Write down the equation which describes the forces which act in the x-direction.
b. write down the equation which describes the forces which act in the y-direction.
c. resolve the x and y components of the force of tension.
D. Find out the value of the frictional force. Do the same for the normal force.
A helicopter is ascending vertically with a speed of 9 m/s. At a height of 200 m above the Earth, a package is dropped from a window. How much time does it take for the package to reach ground.
A basketball player makes a jump shot. The 0.600 kg ball is released at a height of 2.00 m above the floor with a speed of 7.20 m/s. The ball goes through the net 3.10 m above the floor at a speed of 4.20 m/s Find the work done on the ball by air ..
A gauge-12 wire has diameter centimeters and length meters. while the voltage volts is applied to the ends of the wire, the current is amperes. The concentration of free electrons in the wire is per cubic meter.
A thin film with index of refraction n = 1.29 is placed in one arm of a Michelson interferometer, perpendicular to the optical path. If this causes a shift of 8.0 bright fringes of the pattern produced by light of wavelength 693nm, what is the film t..
Both car A and car B leave school at the same time, traveling in the same direction. Car A travels at a constant speed of 71 km/h while car B travels at a constant speed of 90 km/h. how faris car A from school 2.2 h later.
What is the frequency of ultrasound in a medium if he wave length is 3.0 x 10^-3 m and velocity is 1300 mm/ms.
A ball with a horizontal speed of 1.25m/s rolls off a bench 1.00m/s above the floor. how long does it take to reach the floor.How far from a point on the floor directly below the edge of the bench would the ball land.
Valerie is able to do 1200 joules of work in 10seconds. Brett is able to do 5000 joules of work in 50 seconds. Who is more powerful.
assume the roller coaster (h1 = 32 m, h2 = 11 m, h3 = 20) passes point A with a speed of 3.50 m/s. If the average force of friction is equal to one fifth of its weight, with what speed will it reach point B? The distance traveled is 30m.
A light bulb emits light uniformly in all directions. The average emitted power is 150.0 W. At a distance of 4.50 m from the bulb, find out (a) the average intensity of the light, (b) the rms value of the electric field, and (c) the peak value of t..
Using a diesel fired boiler with an efficiency of 80%.How many liters of diesel is required to create 1000kg of steam at 120degrees Celsius from make up water at 20 degrees Celsius.given that enthalpy of steam at 120 degrees Celsius is 2706.3kJ/kg..
A fisherman reels in 12 of line while landing a fish, using the constant forward pull of 35. How much work does the tension in the line do on fish.
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