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Get college assignment help at uniessay writers A diver 55 deep in 10 fresh water exhales a 0.50 diameter bubble. What is the bubble’s diameter just as it reaches the surface of the lake, where the water temperature is 20? Assume that the air bubble is always in thermal equilibrium with the surrounding water.

## A student (m = 61 kg) falls freely from rest and

A student (m = 61 kg) falls freely from rest and strikes the ground. During the collision with the ground, he comes to rest in a time of 0.04 s. The average force exerted on him by the ground is 18000 N, where the upward direction is taken to be the positive direction. From what height did the student fall? Assume that the only force acting on him during the collision is that due to the ground.

## Earthquakes produce two kinds of seismic waves: he longitudinal primary waves

Earthquakes produce two kinds of seismic waves: he longitudinal primary waves (called P waves) and the transverse secondary waves (called S waves). Both S waves and P waves travel through Earth’s crust and mantle, but at different speeds; the P waves are always faster than the S waves, but their exact speeds depend on depth and location. For the pur- pose of this exercise, we assume the P wave’s speed to be 8280 m/s while the S waves travel at a slower speed of 5080 m/s. If a seismic station detects a P wave and then 23.6 s later detects an S wave, how far away is the earthquake center? Answer in units of km.

## After a 0.270-kg rubber ball is dropped from a height of

After a 0.270-kg rubber ball is dropped from a height of 1.85 m, it bounces off a concrete floor and rebounds to a height of 1.35 m.Determine the magnitude and direction of the impulse delivered to the ball by the floor.

## Ampere’s law A wooden ring whose mean diameter is 12.0 cm

Ampere’s law A wooden ring whose mean diameter is 12.0 cm is wound with a closely spaced toroidal winding of 565 turns.Compute the magnitude of the magnetic field at the center of the cross section of the windings when the current in the windings is 0.640 A. I thought the answer was .00379 or 6.03×10−4, but they were both wrong…

## The hydrogen molecular ion {rm H_2^1}, with one electron and two

The hydrogen molecular ion {rm H_2^1}, with one electron and two protons, is the simplest molecule. The equilibrium spacing between the protons is 0.11 {rm nm}. Suppose the electron is at the midpoint between the protons and moving at 1.5 times 10^6 {rm m/s} perpendicular to a line between the protons. How far (in {rm nm}) does the electron move before reaching a turning point? Because of their larger mass, the protons remain fixed during this interval of time. Note, that an accurate description of {rm H_2^1} requires quantum mechanics. Even so, a classical calculation like this provides some insight into the molecule.

## any help would be greatly appreciated!! A long solenoid with 61.0

any help would be greatly appreciated!! A long solenoid with 61.0 turns of wire per centimeter carries a current of 0.160 A. The wire that makes up the solenoid is wrapped around a solid core of silicon steel Km=5200. (The wire of the solenoid is jacketed with an insulator so that none of the current flows into the core.) For a point inside the core, find the magnitude of the magnetic field B_0_vec due to the solenoid current. For a point inside the core, find the magnitude of the magnetization M_vec and for a point inside the core, find the magnitude of the total magnetic field B_vec.

## A toroidal solenoid with 540 turns is wound on a ring

A toroidal solenoid with 540 turns is wound on a ring with a mean radius of 2.85 cm. Find the current in the winding that is required to set up a magnetic field of 0.330 T in the ring if the ring is made of annealed iron (Km= 1400) and a ring of silicon (km=5200) . thanks in advance..

## When a 162 N bag of nails hangs motionless from a

When a 162 N bag of nails hangs motionless from a single vertical strand of rope, how much tension is exerted in the strand?

## capacitor plates have area 5.00 cm^2 and separation 2.00 mm. The

capacitor plates have area 5.00 cm^2 and separation 2.00 mm. The plates are in vacuum. The charging current i_C has a constant value of 1.80 mA. At t = 0 the charge on the plates is zero.Calculate the charge on the plates when t=0.500 u_s (mu sub s and find the electric field between the plates when t=0.500 u_s.

## If solar cells used have an efficiency of 10%, what area

Get college assignment help at uniessay writers If solar cells used have an efficiency of 10%, what area of land is needed to produce an output of 1000MW? assume that the mean insolation is 500W/m^2

## How many square meters of pv would it take to provide

How many square meters of pv would it take to provide 1 kw for a world population of 6 billion? if these cells were crystalline silicon of 200 microns thick, what is the minimum mass of silicon material needed for this venture? ( density of silicon = 2330 kg/m^3)

## A dock worker loading crates on a ship finds that a

A dock worker loading crates on a ship finds that a 17 kg crate, initially at rest on a hori- zontal surface, requires a 75 N horizontal force to set it in motion. However, after the crate is in motion, a horizontal force of 59 N is required to keep it moving with a constant speed. The acceleration of gravity is 9.8 m/s2 . Find the coefficient of static friction be- tween crate and floor.

## A uniform rod of length 0.790 m and mass 14.5 kg

A uniform rod of length 0.790 m and mass 14.5 kg is balanced on a sharp edge at 0.650 m from the left end. At the left end hangs a mass of 45.0 kg and the right end hangs an unknown mass so that the whole assembly is in equilibrium. Calculate the torque on the center of mass of the rod alone with respect to the pivot point.

## A container has a large cylindrical lower part with a thin

A container has a large cylindrical lower part with a thin cylindrical neck. The lower part of the container holds 12.5 m^3 of water and the surface area of the bottom of the container is 5.00 m^2. The height of the lower part of the container is 2.50m and the neck contains a column of water 8.50m high. The total volume of the column of water in the neck is 0.200 m^3. What is the magnitude of the force exerted by the water on the bottom of the container?

## A uniform rod of length 0.890 m and mass 11.5 kg

A uniform rod of length 0.890 m and mass 11.5 kg is balanced on a sharp edge at 0.640 m from the left end. At the left end hangs a mass of 45.0 kg and the right end hangs an unknown mass so that the whole assembly is in equilibrium. Calculate the torque on the center of mass of the rod alone with respect to the pivot point

## A 2200 kg pile driver is used to drive a 1100

A 2200 kg pile driver is used to drive a 1100 kg steel I-beam into the ground. The pile driver falls 5.0 m before contacting the beam, and it drives the beam 10 cm into the ground before coming to rest. What is the average force the beam exerts on the pile driver while the pile driver is brought to rest? (Answer in Newtons, where up is positive and down is negative.)

## Traffic Accident Your friend is going to court to determine fault

Traffic Accident Your friend is going to court to determine fault in an accident. She thinks that the other car was speeding and she was not. She is looking to you for help to prove her assertion. During discovery, the following evidence is presented, none of which is disputed by the other driver: Weather records indicate that there was no rain the day of the collision Your friend was traveling north just before the collision and the other car was traveling east The two cars got stuck together and remained so after the collision while skidding to a stop The speed limit on both roads is 45 mph Measurements of skid marks created after the collision indicate that the cars skidded 50 feet at an angle of 30 degree north of east before stopping According to driver’s manuals, your friend’s car weighs 2400 lbs and the other car weighs 2000 lbs. Each driver weighs 150 lbs and there was no significant cargo A physics textbook indicates that the coefficient of kinetic friction for rubber on dry pavement is 0.80 What can an analysis of the physics of this collision and aftermath tell the court regarding the speeds of the vehicles before they collided?

## A ceiling fan with 89 cm diameter blades is turning at

A ceiling fan with 89 cm diameter blades is turning at 61rpm . Suppose the fan coasts to a stop 26s after being turned off. What is the speed of the tip of a blade 10 after the fan is turned off? Through how many revolutions does the fan turn while stopping?

## A vertical spring with a spring constant of 450 N/m is

A vertical spring with a spring constant of 450 N/m is mounted on the floor. From directly above the spring, which is unstrained, a 0.30-kg block is dropped from rest. It collides with and sticks to the spring, which is compressed by 2.5 cm in bringing the block to a momentary halt. Assuming air resistance is negligible, from what height (in cm) above the compressed spring was the block dropped?

## The 1.8 kg, 20 cm diameter disk in the figure below

The 1.8 kg, 20 cm diameter disk in the figure below is spinning at 240 rpm. How much friction force must the brake apply to the rim to bring the disk to a halt in 2.5 s?

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