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A train travels due south at 30 m/s (relative to the ground) in a rain that is blown toward the south by the wind. The path of each raindrop makes an angle of 70° with the vertical, as measured by an observer stationary on the ground. An observer on the train, however, sees the drops fall perfectly vertically. Determine the speed of the raindrops relative to the ground.
A student uses an audio oscillator of adjustable frequency to measure the depth of a water well. how many antinodes are in the standing wave
Each of the sources in the drawing emits a frequency of 4.57 multiplied by 1014 Hz, and the speed v is 2.50 106 m/s. Calculate the observed frequency fo in situation A. fo =? Unit
The leg and cast weigh 290 -N, with the center of mass as indicated by the blue arrow in the diagram. The counterbalance w2 weighs 120 N. Determine the weight w1 and angle α needed in order that there is no force exerted on the hip joint by the le..
A refracting telescope is used to view the Moon (diameter 3480 km, distance from Earth 385,000 km). What should be the distance between the lenses
an atom with mass m emits a photon of wavelength a.a what is the recoil speed of the atom?b what is the kinetic energy
A sample containing beryllium (atomic mass 9 u), aluminum (27 u), and an unknown element is placed in a mass spectrometer. What is the mass of the unknown element
a weightlifter works out at the gym each day. part of her routine is to lie on her back and lift a 41kg barbell
Sam pushes a 10.0-kg sack of bread flour on a frictionless horizontal surface with a constant horizontal force of 4.0 N starting from rest. What is the speed of the sack after Sam has pushed it a distance of 20 cm
When a fish looks up at an angle of 45 degrees with the horizon, does it see the sky or the reflection of the bottom beneath? Explain why.
a parallel plate capacitor consisting of two square plates has a potential difference V0 across the plates, and separated by a gap of 1.1mm. what is the magnitude of the electric field inside the capacitor
Three children are riding on the edge of a 1.60-m-radius, 100 kg merry-go-round, spinning at 20.0 rpm. what is the new angular velocity in rpm
A source of sound moves toward you at speed vs, and away from Jane, who is standing on the other side of it. You hear thesound at twice the frequency as Jane. What is the speed of the source? Assume that the speed of sound is 340 m/s.
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