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A projectile is launched so that its point of launch is lower than its landing point.
a) When is the vertical velocity at a maximum?
b) When is the horizontal velocity at a maximum?
c) When is the vertical velocity at a minimum?
d) What is the acceleration of the object at the very top of its path? Explain.
e) Which will take longer: the upward motion or the downward motion?
A piano wire with mass 3.20 g and length 77.0 cm is stretched with a tension of 25.0 N. Calculate the average power carried by the wave
A light-emitting diode (LED) connected to a 3.0 V power supply emits 440 nm blue light. The current in the LED is 16mA , and the LED is 71{\rm \\%}
Apply this to gene expression as a whole and hypothesize other possible effects of this particular environmental factor.
A 2.3A current is flowing in a 25H inductor. A switch is opened, interrupting the current in 1.0ms. Find the induced emf in the inductor
An ammeter connected to the main wire measures 0.87 A. What is the expected electric pressure difference across one bulb?
A simple generator has a 620-loop square coil 21cm on a side. How fast must it turn in the 0.690 T field to produce a 140 V peak output.
A solid sphere has a temperature of 527 K. The sphere is melted down and recast into a cube that has the same emissivity and emits the same radiant power as the sphere. What is the cube's temperature in kelvins?
A solid sphere of uniform density starts from rest and rolls without slipping down an inclined plane with angle θ = 30o. The sphere has mass M = 8 kg and radius R = 0.19 m . The coefficient of static friction between the sphere and the plane is μ = 0..
for a vibrating string fixed at both ends what is the relationship between the length of the string and the wavelength
Suppose this car is accelerated from rest by a force of 8,100 N to the east. What is the car's velocity after 8.0 s?
If the coefficient of kinetic friction between the piece of fruit and the 17.6° sloped hill is 0.540, calculate the work done by the ant by pulling the piece of fruit up the hill
A charging bull elephant with a mass of 5240 kilogram comes directly towards you with a speed of 4.55 m/s. When the ball bounces back toward you, evaluate what is its speed
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