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Q. A cannonball is fired from a cliff 140m high downward at an angle of 27 degrees with respect to the horizontal. if the cannon's muzzle velocity is 34 m/s, what is the cannon ball's speed when it hits the ground?
Q. in a certain vacuum tube,electron evaporates from a hot cathode at a slow steady rate and accelerates from rest through a potential difference of 45V then they travel 28cm.as they passes through an array of slits and fall on a screen to produce an interference pattern.if the beam current is below a certain value, only one electron at a time will be in flight in the tube.What is the value? in this situation, the interference pattern still appears showing that each individual electron can interfere with itself.
A professor's office door is 0.9 wide, 2.2 high, 4.2 thick; has a mass of 23 , and pivots on frictionless hinges. A "door closer" is attached to door and the top of the door frame. while the door is open and at rest, the door closer exerts a torqu..
An airplane is flying with a velocity of 89.0 at an angle of 18.0 above the horizontal. When the plane is the distance 112 directly above a dog that is standing on level ground, a suitcase drops out of the luggage compartment. How far from the dog wo..
The position of an air-track cart that is oscillating on a spring is given by the equation x = 12.4 cos[(6.35 s-1)t] . At what value of t after t= 0.00s in the cart first located at x = 8.47 cm ?
Blocks with masses of 2.0 , 4.0 , and 6.0 are lined up in a row on a frictionless table. All three are pushed forward by a 57 N force applied to the 2kg block.How much force does the 4 block exert on the 6.0 block.
Estimate mean and maximum velocities for a liquid
A somewhat longer cable replaces the old and is attached to the steel bar 5 m from its upper end, connecting to the same place on the wall as before and maintaining the same angle between the bar and the wall.
A dock worker applies a stable horizontal force of 79.0 {rm N} to a block of ice on a smooth horizontal floor. The frictional force is negligible. The block starts from rest and moves 14.0 {rm m} in the first 6.00 {rm s}.What is the mass of the bl..
Vector A has a magnitude of 10m and makes an angle of 78o with the positive x axis. Vector B also has a magnitude of 13m and is directed along the negative x axis. Enter your answers in distance then angle (in degrees).
A hiker's trip consists of three segments. Path A is 8.0 km long heading 60degrees north of east. Path B is 7.0km long in a direction due east. Path C is 4.0 km long heading 315 degrees counter clockwise from east.
Compute the force of tension or compression
Find the position of an object in front of a screen to obtain an image of size twice larger than its original size on the screen.
One mole of an ideal gas at 27 °C is expanded isothermally from an initial pressure of 3 atm to a final pressure of 1 atm in two ways. (a) reversible, and (b) against a constant external pressure of 1 atm. find q, w, ΔU, ΔH, ΔSsys, ΔSsurr, ΔStotal..
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