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A vacuum cleaner produces sound by a measured sound level of55.0 dB.
a) What is the intensity of this sound in W/m2?
b) What is the pressure amplitude of the sound?
A 2.8{\rm kg} block of wood sits on a table. A 3.0 {\rm g} bullet, fired horizontally at a speed of 370{\rm m/s} , What is the speed of the block immediately after the bullet exits
violet light and red light travel through air and strike a block of plastic at the same angle of incidence. the angle
The cannonball is fired at a speed of 53.0 and an angle of 31 above horizontal. A cannonball that was accidentally dropped hits the moat below in 1.40. How far from the castle wall does the cannonball hit ground.
if the average volume flow of blood through the aorta is 9.4 x 10-5 m3s and the cross-sectional area of the aorta is
Two 10-cm charged disks face each other, 20 cm apart. The left disk is charged to -30 nC and the right disk is charged to +30 nC. What is the electric field (both magnitude and direction) at the midpoint between the disks? What would be the force (ag..
An object at 20 degrees celsius with heat capacity of 100 cal/degrees celsisu is placed in 40g of water at 100 degreescelsius. After equilibrium is reached, the object is removedfrom the hot water and placed in 200g of water at 0 degreescelsius.
Two particles with masses m1 = 1 kg and m2 = 3 kg are moving toward each other along the x axis with the same initial speeds vi = 1 m/s. Find the final speeds of the two particles
You are on a boat in a fog and know there are cliffs ahead of you somewhere, but you cannot see them. How far away are the cliffs
Your spaceship lands on an unknown planet. To determine the characteristics of this planet, you drop a 1.20 kg wrench from 3.00 mm above the ground, Express the planet's mass in terms of the earth's mass
The human body converts internal chemical energy into work and heat at rates of 60 to 125 W (called the basal metabolic rate). This energy comes from food and is usually measured in kilocalories [1 kcal = 4.186 kJ].
A satellite is in a circular orbit very close to the surface of a spherical planet. The period of the orbit is 1.85 hours. What is density of the planet? Assume that the planet has a uniform density.
q1. a sled is being held at rest on a slope that makes the angle with the horizontal. after the sled is released it
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