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A roller-coaster car moves 207 ft horizontally and then rises 119 ft at an angle of 30° above the horizontal. It then travels 119 ft at an angle of 40° downward. What is its displacement from its starting point?
d =, ? = ?
A 1450 N uniform boom is supported by a cable as shown. The boom is pivoted at the bottom, and a 1270 N object hangs from its end. Find the tension in the cable holding up the boom
Male mosquitoes in the mood for mating find female mosquitoes of their own species by listening for the characteristic "buzzing" frequency of the female's wing beats.
Two long parallel wires each carry a current of 5. A directed to the east. The two wires are separated by 8 cm. What is the magnitude of the magnetic field at a point that is 5.0 cm from each of the wires.
A 7 g bullet moving horizontally at 200 m/s passes through a 150 g tin can sitting on a post. What was the bullets speed after leaving the can
A 50.0kg crate is being pulle along a horizontal smooth surface. What is the magnitude of the normal force acting on the crate
A plane flies at 1.75 times the speed of sound. Its sonic boom reaches a man on the ground 1.00 min after the plane passes directly overhead
you kick a soccer ball 15 meters without hurting your foot much. you then pump the ball up until it is really hard the
A loudspeaker of mass 22.0 {rm kg} is suspended a distance of h = 1.60 {rm m} below the ceiling by two cables that make equal angles with the ceiling. Each cable has a length of l = 3.90 {rm m}.
The highest rotary speed ever attained was 2010 m/s (4500 mph). The rotating rod was 15.2 cm (6 in.) long. What is the period of rotation of the rod
Find the critical angle of total internal reflection from glass with refraction index n = 1.51 into air
Four identical metallic objects carry the following charges: +1.79, +6.21, -4.16, and -9.41C. The objects are brought simultaneously into contact, What is the final charge on each object
An 8.00 gram bullet is fired into a 250gm block that is initially at rest at the edge of a table of height 1.0 m. The bullet remains in the block, and after the impact the block lands 2.0 meters from the bottom of the table. Find out the initial s..
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