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Q. A golfer drives a 0.046kg golf ball from an elevated tee, giving the ball an initial horizontal velocity of 45 m/s. (a) what is the magnitude of the average force exerted by the club on the ball if the contact time for the golf club on the ball during impact is 0.9 milliseconds? (b) assume a better golfer uses the same average force as the golfer in part(a) but "follows through" on the swing to increase the contact time of the golf club to the ball to 1.4 ms. what effect would this change have on an initial horizontal sped of the drive?
Two long, parallel wires are separated by a distance of 3.40. The force per unit length that each wire exerts on the other is 3.20×10-5, and the wires repel each other. The current in one wire is 0.6690.
A spaceship moves past you at speed v. You calculate the ship to be 364 m long, whereas an astronaut on the ship measures a length of 420 m. Find v.
A 0.65 percent C hypoeutctoid plain carbon steel is slowly cooled from about 950°C to a temperature just slightly above 723°C. calculate the weight percent austenite and weight percent proeutectoid ferrite in this steel. Explain it.
Two boats start together and race across a 56km wide lake and back. Boat A goes across at 56 km/h and returns at 56km/h. Boat B goes across at 28km/h, and its crew, realize how far behind it is getting.
A 78-kg man standing on a scale in an elevator notes that as elevator rises, the scale reads 834 N. What is the acceleration of the elevator.
Tritium (3H) decays by negative beta decay with a half-life of 12.16 years. Use an atomic weight. What is the mass in g of 1 mCi of tritium? 3.026 For 3H.To what nucleus does 3H decay.
A person wears a hearing aid that uniformly increases the intensity level of all audible frequencies of sound by 29.7 dB. The hearing aid picks up sound having a frequency of 250 Hz at an intensity of 3.10 10-11 W/m2. What is intensity delivered to t..
What is the propotion of the mass of these excess electrons to the mass of the penny.
Kieran takes off down a 50m high, 10° slope on his jet-powered skis. The skis have a thrust of 320 N. The combined mass of skis and Kieran is 50 kg (the fuel mass is negligible). Kieran's speed at the bottom is 40 m/s. What is the coefficient of k..
Find the modulation index corresponding to the given trapezoidal pattern for the AM signal.
A spring stiffness 900 N/m and relaxed length 1m stands vertically on a table. You hold a block of mass 1 kg barely touching the top of the spring. Assume you let the mass down onto the spring certain distance very slowly and view the mass is not mov..
A capacitor is connected across the terminals of an ac generator that has a frequency of 370 Hz and supplies a voltage of 15 V. When a second capacitor is connected in parallel with the first one, the current from the generator increases by 0.27 A. D..
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