Physics Work,Power & Energy Level: University
Conservation of energyA person stands on the edge of a cliff and throws a stone vertically downward with an initial speed of 10m/s. The instant before the stone hits the ground it has 450J of kinetic energy. If the stone were to be thrown horizontally outward from the cliff with the same initial speed of 10m/s how much kinetic energy would it have just before it hits the ground?
Physics Work,Power & Energy Level: University
WorkA man is using a human powered mower to cut grass. The mower is pushed with a force of 45N directed at an angle of 41 degree below the horizontal direction. What is the work done in pushing the mower 9.1 m across the yard?
Physics Dimensions Level: University
Circular MotionThe second on a watch has a length of 4.5 mm and completes one revolution in 60.00 s. What is the speed of the end of the second hand as it moves in uniform circular motion?
Physics Force & Laws Of Motion Level: University
FrictionA rope connects boat A to Boat B. Boat A starts from rest and accelerates to a speed of 9.5m/s in a time of 47 s. The mass of Boat B is 540 kg. Assuming a constant frictional force of 230N on Boat B what is the magnitude of the tension in the rope that connects the boats during the time of acceleration?
Physics Force & Laws Of Motion Level: University
Law of MotionA 20 kg object is held vertically from a fixed plank by two vertical ropes. What is the tension in each rope?
Physics Force & Laws Of Motion Level: University
Laws of MotionA 10 kg block is moving at a constant speed of 6 m/s horizontally on a rough surface. If the force of friction is 20N approx how far will the block travel before it stops?
Physics Heat & Thermodynamics Level: University
Thermal expansionZirconium tungstate is an unusual material as its volume shrinks with an increase in temperature for the temperature range 0.3 k to 1050 K ( where it decomposes). The volumetric coefficient of thermal expansion is -26.4 x 10 -6 / K. What is the ratio Delta V upon V not for the above temperature range ( in percentage)?
Physics Heat & Thermodynamics Level: Middle School
A metal rod 40.0000 cm long at 40 degree C is heated to 60 degree C. The length of the rod is then measured to be 40.0105 cm. What is the coefficient of linear expansion of the metal in units of / C?
Physics Properties Of Matter Level: University
Low of floationA balloon is released from a tall building. The total mass of the balloon including the enclosed gas is 2.0 kg. Its volume is 5.0 m3 .The density of the air is 1.3 kg/m3. Will the balloon rise fall or remain stationary and why?
Physics Properties Of Matter Level: University
Law of floatationThe density of ice is 0.92 g/cm3 and the density of seawater is 1.03 g/cm3. A large iceberg floats in the Arctic water. What fraction of the volume of the iceberg is exposed?
Physics Properties Of Matter Level: University
A balloon inflated with helium ( density = 0.2 kg/ m3) has a volume of 6 x 10 - 3 m3. If the density of air is 1.3 kg / m3 what is the buoyant force exerted on the balloon?
Physics Properties Of Matter Level: University
Fluid in motionA force of 250N is applied to a hydraulic jack that is 0.01 m in diameter. If the piston which supports the load has a diameter of 0.10 m approx how much mass can be lifted by the load piston? Disregard any height differences between pistons.
Physics Properties Of Matter Level: University
Fluid in motionA force of 250N is applied to a hydraulic jack that is 0.01 m in diameter. If the piston which supports the load has a diameter of 0.10 m approx how much mass can be lifted by the load piston? Disregard any height differences between pistons.
Physics Heat & Thermodynamics Level: University
GasUsing the value of atmospheric pressure at sea level 1.0 x 105 pa estimate the total mass of the earths atmosphere above a area.
Physics Heat & Thermodynamics Level: University
GasHow much force does the atmosphere exert on one side of a vertical wall 4.0 m high and 10 m long?
