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The lob in tennis is an effective tactic when your opponent is near the net. It consists of lofting the ball over his head, forcing him to move quickly away from the net (see the drawing). Suppose that you lob the ball with an initial speed of 16.5 m/s, at an angle of 52.5° above the horizontal. At this instant your opponent is 10.0 m away from the ball. He begins moving away from you 0.30 s later, hoping to reach the ball and hit it back at the moment that it is 2.10 m above its launch point. With what minimum average speed must he move? (Ignore the fact that he can stretch, so that his racket can reach the ball before he does.)
A car travelling at 105 strikes a tree. The front end of the car compresses and the driver comes to rest after travelling 0.85. What was the magnitude of an average acceleration of the driver during the collision? State the answer in terms of "'s,..
In a long solenoid, the density of the wire is 180 turns/cm. find the strength of the magnetic field within the solenoid
A soap film with different thicknesses at different places has an unknown refractive index n and air on both sides. Find the ratio tmagenta/tyellow
A daring ranch hand sitting on a tree limb wishes to drop vertically onto a horse galloping under the tree. The constant speed of the horse is 10.0 m/s, and the distance from the limb to the level of the saddle is 3.00 m.
A 3.5-kg block of iron (c=0.11 kcal/kgoC) that has been brought to a temperature of 1,063oC is placed on top of a 2.5-kg block of ice (c=0.5 kcal/kgoC) that has been cooled to -50oC
Two point charges Q1 = +5.70 nC and Q2 = %u22122.40 nC are separated by 25.0 cm. What is the potential energy of the pair of charges
A uniform door weighs 46-N and is 0.9 m wide and 2.5 m high. What is the magnitude of the torque because of the door's own weight about a horizontal axis perpendicular to the door and passing through a corner.
Water flows through a 4 cm diameter pipe at 4 m/s and with a gauge pressure of 2 atm. what will be the pressure in the narrower pipe
A cancer patient is undergoing radiation therapy in which protons with an energy of 1.2 MeV are incident on a 0.25 Kg tumour. (a) If the patient receives an effective dose of 1.0 rem, what is the absorbed dose? (b) How many protons are absorbed by..
Determine how many times greater heat loss occurs through a glass window thats 80.0 cm high, 70 cm wide, and 0.300 cm thick (k = 0.791 W/m°C) than a electrical supply line running outside to an exterior mounted light.
target 1 cm2 in area and 0. 1 cm thick. There are 0.048 x 1 024 atoms per cm3 in the target, and the total cross-section at the energy of the beam is 4.5 b. What is the macroscopic total cross-section
A large sponge has forces of magnitude 12 N applied in oppositedirections to two opposite faces of area 42 cm^2. What is theshear modulus of the sponge
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