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A standard bowling ball weighs 17 pounds. You wish to hold a bowling ball infront of you, with the elbow bent at a right angle. Suppose that your biceps attaches to your forearm at 2.5 cm out from the elbow joint, and that your biceps muscle pulls vertically upward, that is, it acts at right angles to the forearm. Also suppose that the ball is held 38 cm out from the elbow joint. Let the mass of your forearm be 4.9 kg and assume its center of gravity is located 19 cm out from the elbow joint. How much force should your biceps muscle apply to forearm in order to hold out the bowling ball at the desired angle?
If you run the wire between the poles of a strong horseshoe magnet, subjecting 5.00 cm of it to a 1.95 T field (perpendicular to the wire), what force is exerted on this segment of wire
As a 1.00 mol sample of a monatomic ideal gas expands adiabatically, the work done on it is -2500 J. Calculate the final pressure and temperature
A parallel plate capacitor has plates of area A and seperation of d and is charged to a potential difference of V.Derive expressions for the new potential difference
the brakes of a truck cause it to slow down by applying a retarding force of 3.40 x 103 n to the truck over a distance
A car is driven east for a distance of 48km, then north for 32 km, and then in adirection 31°east of north for 25 km. Draw the vectordiagram and determine the total displacement of the car from itsstarting point.
An electric kettle of 7.0 ohm resistance containing 500cm3 of water at 10 degrees Celsius is connected to the110 V supply. If 10% of the electrical energy is wasted byimperfect insulation, calculate how long it takes to convert allthe water into s..
A disc-shaped grindstone of mass 3.0 kg and radius 8.0 cm is spinning at 600 rev/min. What was the stone's initial kinetic energy
two billiard balls of equal mass undergo a perfectly elastic head-on collision. if one balls initial speed was 2.50 ms
The barricade at the end of a subway line has a large spring designed to compress 2.00 m when stopping a 1.60 ? 105 kg train moving at 0.300 m/s. What speed would the train be going if it only compressed the spring 0.900 m
A wave pulse travels down a slinky. The mass of the slinky is m = 0.94 kg and is initially stretched to a length L = 7.5 m. What is the speed of the wave pulse
The speed of a bobsled is increasing because it has an acceleration of 2.1 m/s2. At a given instantin time, the forces resisting the motion, including kineticfriction and air resistance, total 450 N. The mass of the bobsledand its riders is 240 kg.
a farsighted woman breaks her current eyeglasses and is using an old pair whose refractive power is 1.600 diopters.
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