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A policeman must lob tear gas through a window as shown below. He determines that a firing angle of 53.1o will do if the shell leaves the gun at 20 m/s. The point of firing is 2.0 m above the ground. The shell enters the window 10.0 m above the ground and must be on its way down in order to miss the balcony.
-(a) Find the horizontal and vertical components of the shell's velocity as it leaves the gun.
-(b) What is the shell's velocity 2.0 s after firing?
-(c) What is the distance from the point of firing to the building?7. A Roman soldier calculates that in order for a stone from his catapult to just reach the gate of the hill fort, he must shoot the stone at 50 m/s at an angle of 20o above the horizontal. The point at which the stone leaves the catapult is 3.0 m above the ground, and the gate of the hill fort is at the same level as the foot of the catapult.
(a) Find the horizontal and vertical components of the stone's velocity at t = 0
(b) How long will it take the stone to reach the gate?
(c) How far is the catapult from the gate?
(d) What is the stone's velocity as it lands (just before it touches down)?
A sanding disk with rotational inertia I is attached to an electric drill whose motor delivers a torque of magnitude? about the central axis of the disk. what is the magnitude of the angular momentum
A rubber ball is able to bounce 0.90 times the height from which it is dropped. WHat is the ball's resultant displacement from it's initial hieght to it's maximum height after one bounce
The telescope at Yerkes Observatory in Wisconsin has an objective whose focal length is 19.4 m. Its eyepiece has a focal length of10.0 cm. What is the angular magnification of the telescope
A 10 g ball of clay traveling east at 1.5m/s collides and sticks together with a 30g ball of clay traveling north at 2.5m/s. What is the speed of the resulting ball of clay
1.what morphologic characteristics of Hyacotherium suggest that it lived in thick, closed canopy forest 2. How did the increase in grasslands beginning in the miocene influence the morphology of horse teeth and jaw
An 8.70-kg block slides with an initial speed of 1.80 m/s down a ramp inclined at an angle of 22.2 deg with the horizontal. Use energy conservation to find the distance the block slides before coming to rest
If an object is placed between two parallel thin plane mirrors, an infinite number of images result. Find the distance of the images formed from the object
The aluminium wire in a high-voltage transmission line is 2.7 cm in diameter. It is designed to carry a current of 1100 A. What is the voltage drop across a 32-km-long segment of this power line?
What is the maximum magnification of a magnifying glass with a power of + 5.0D for a person with a near point of 25 cm
A 0.710 m long solenoid is formed by wrapping 450 turns of wire around a hollow cylinder with a radius of 0.280 m. Calculate the energy stored in the field
Suppose a clay model of a koala bear has a mass of 0.27 kg and slides on ice at a speed of 1.124 m/s. It runs into another clay model,which is initially motionless and has a mass of 0.457 kg. Both being soft clay, they naturally stick together. Wh..
A home receives 1.4kW of electric power from a transformer on a nearby pole. What fraction of the power is lost in this transmission line
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