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A sand mover at a quarry lifts 2.00E3 kg of sand per minute averticle distance of 12.0 m . The sand is initially at rest and isdischarged at the top of the sand mover with a speed of 5.00 m/sinto a loading chute. What is the minimum power that must besupplied to this machine ( which aaumes no nonconservativeforces)?
In the macroscopic world, you know that you can hear but cannot see around corners. Explain why sound diffracts easily around a classroom door
For red light (lamda = 0.64um), ni in pure water is approx 1.3 x 10^-8; for blue light (lamda = 0.48um), ni is approx 1.0x10^-9. The deep end of a typical home swimming pool is approx 2.5m deep.
A 512-turn circular-loop coil with a diam- eter of 17.4 cm is initially aligned so that its plane is perpendicular to the Earth’s mag- netic field. In 2.46 ms the coil is rotated 90.0? so that its plane is parallel to the Earth’s magnetic field. An a..
A tennis ball is hit with a vertical speed of 30 m/s and a horizontal speed of 25 m/s. How long will the ball remain in the air
David Purley, a racing driver, survived deceleration from 173 km/hto 0 km/h over a distance of .660 m when his car crashed. find the average force acting on him during the crash
A 9.4-kg watermelon (30 degrees)and a 7.8-kg pumpkin (53 degrees) attached to each other via a cord that wraps over a pulley, Find the accelerations of the pumpkin and the watermelon
A child leaves her book bag on a slide. The bag, which is at the top of the slide, starts from rest and reaches the bottom in 1.40 s. What is the friction force acting on the bag
An equilateral triangle 10.0m on a side has a 1.00-kg mass at one corner, and a 2.50-kg mass at the each of the other two corners
A spring is stretched between two posts. When a pulse is produced at one end of the spring, it makes 4 back-and-forth trips along the spring in 3.4 s. If the pulse has a propagation speed of 12 m/s, how far apart are the posts?
Two slits with a separation of 8.5 x 10-5 cm create an interference pattern on the screen 2.3 m away. what is the wavelength of the light used
Two lenses, the first with focal length 10.0 cm and the second with focal length -12.5 cm, are separated by 20.0 cm. What is the size of the final image and what is its position
The needle of a sewing machine moves up and down in the same hermonic motion its driving force comes from a rotating wheel that is powered by an electric motor. how do you imagine that theup-and-down needle comapres with the period of the rotating..
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