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A lawn mower has a flat, rod-shaped steel blade that rotates about its center. The mass of the blade is 0.65 kg and its length is 0.55 m . What is the rotational energy of the blade at its operating angular speed of 3480 rpm?
a park ranger wanted to measure the height of a tall tree. The ranger stood 9.50 m from the base of the tree, What is the height of the tree
A child rides a horse in a circular path on a merry-go-round. how far is the horse from the center of the merry-go-round
An electron initially at rest is accelerated between two parallel plate 2.000 cm apart, What kinetic energy does the electron have when it hits the positive plate
Two small metallic spheres, each of mass m = 0.25 g, are suspended as pendulums by light strings from a common point as, compute the magnitude of the charge on each sphere
A 16 kg wood ball hangs from a 2 m-long wire. The maximum tension the wire can withstand without breaking is 435 N. A 1.2 kg projectile traveling horizontally hits and embeds itself in the wood ball. What is the largest speed the projectile can ha..
The first accurate estimate of cell membrane thickness used a capacitive technique, which determined the capacitance per unit area of cell membrane in a macroscopic suspension of cells; find the membrane's thickness
A heat pump has a coefficient of performance of 3.85 and operates with a power consumption of 7.14 103 W. How much energy does it extract from the outside air
An unknown mass of tin is heated to a temperature of 218 C. It is placed into 200 g of water which is in a 100 g copper cup initially at 10 C. What is the heat lost by the sample of tin
A 280-g block on a 52 cm long string swings in a circle on a horizontal, frictionless table at 95 rpm. What is the speed of the block.
An unstable particle having mass of 5.00x10^-27 kg is initially at rest. Find the rest masses of the fragments
What is the speed of crate hit ground
A charge of -2.85 µC is fixed at the center of a compass. Two additional charges are fixed on the circle of the compass, which has a radius of 0.105 m. The charges on the circle are -3.8 µC at the position due north and +4.55 µC at the position du..
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