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The middle C string on a piano is under a tension of 744 N. The period and wavelength of a wave on this string are 3.82 10-3 s and 1.26 m, respectively. Find the linear density of the string.
An oil drop carries one excess electron and weighs 9.3 x10-15 N. What electric field strength is needed to suspend the drop so it is motionless.
Consider an infant who weighs 100 newtons. During each year she grows so that each dimension of her body increases by 5%. How much would she weigh then.
Write down an energy transformation equation
A wheel 55-cm in diameter accelerates uniformly from 240 rpm to 395 rpm in 5.0 s. How far will a point on the edge of the wheel have travelled in this time.
A 20 kg child is on the swing that hangs from a rope 3.5 m long. What is her speed at the bottom of her arc if she swings to out 90 degrees.
our little sister builds 2 tree houses and stretches a rope between them for sending messages to other tree house. She hangs a mass of 1.4kg on one end of the rope that passes over the pulley.
A dolphin leaps out of the water at the angle of 46° above the horizontal. The horizontal component of the dolphin's velocity is 9.40 m/s. Find out the magnitude of the vertical component of velocity.
A 320 kg rocket sled can be accelerated at a constant rate from rest to 1400 km/h in 2.0 s. What is the magnitude of the necessary net force.
if the airplane somehow continues to fly as if nothing happend, where is the engine relative to airplane at the moment the engine hits the ground.
What is the potential difference in volts between the plates.
include a free body diagram. Be sure to label all forces with their agents and size. 1. A 5.0kg cat running along suddenly braces his furry feet on the slippery floot in order to stop.
Each tire of an automobile has an area of 0.026m^2 in contact with the ground. The weight of the automobile is 2.6x10^4 N. What is the pressure in the tires.
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