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Michael Phelps won a gold medal at the 2008 Beijiing olympics by swimming the 200 meter medley in 1:54:80. On an off-day Mike swims the medley in 1:58:32. What is the speed in mph? (Give the ans. to two decimal places)
You are driving to grocery store at 21. You are 100 from an intersection when the traffic light turns red. Presume that your reaction time is 0.75 and that your car brakes with constant acceleration. How far from the intersection are you when you ..
Calculate the threshold wavelength, in nm, of a metal if that metal emits an electron with a kinetic energy of 6.32 × 10-19 J when illuminated with light that has a frequency of 1.97 × 1015 Hz.
A person driving her car at 53.0 km/h approaches an intersection while the traffic light turns yellow. She knows that the yellow light lasts only 2s before turning to red.
The Apollo Lunar Module was used to create the transition from the spacecraft to the moon's surface and back. Consider the similar module for landing on the surface of Mars. Use conservation of mechanical energy to answer these questions.
A very long solenoid with a circular cross section and radius r= 8.1cm with n= 1.90E+4 turns/m has a magnetic energy density uB= 5.70 mJ/m3. What is the current in solenoid.
Two insulated wires, each 2.50 m long, are taped together to form a two-wire unit that is 2.50 m long. One wire carries a current of 7A; the other carries a smaller current I in the opposite direction. The two wire unit is placed at an angle of 78..
A wire streches from the top of a vertical pole to a point on level ground 16 feet from the base of the pole. if the wire makes an angle of 62 degrees withe the ground, find the height of the pole and length of the wire.
A violinist places her finger so that the vibrating section of a 1 g/m string has a length of 40.00 cm, after that she draws her bow across it. A listener nearby in a 20 ^circ {rm C} room hears a note with a wavelength of 30 cm.
A 1650-kg car is travelling at 31.2 m/s. How fast must a 91.0-kg bicycle and rider be travelling to have the similar kinetic energy as the car.
A pendulum of length 1.5 m is held out to point A. At the vertical position, an overhang effectively cuts the length of the pendulum by an amount equal to 1.09 m. (That is, 1.0 m is no longer free to swing.) How long does this pendulum take for one o..
Having taken a nap under a tree only 20 m from the finish line, Rabbit wakes up to find Turtle 19.5 m beyond him, grinding along at 1/4 m/s. If the bewildered hare can accelerate at 9 m/s2 up to his top speed of 16 m/s (36 mi/h) and sustain that s..
A parallel beam of light from a He-Ne laser, with a wavelength of 662nm, falls on two very narrow slits 0.050 mm apart. How far apart are the fringes in the center of the pattern if the screen is 2.5m away.
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