Wednesday

July 23, 2014

July 23, 2014

Total # Posts: 40

**PHYSICS**

A 0.75 Tesla bar magnet is placed inside of a coil made up of 350 turns of wire, each loop having an area of 0.002 m^2. How much electromagnetic flux is created when the magnet is quickly pulled out of the coil? How much voltage is induced in the coil if the magnet is removed ...

**PHYSICS**

A beam containing one hundred billion (i.e. 1x10^11) electrons moves perpendicula to a 4.0 Tesla magnetic field and is deflected by a 12 N force. (The electrons has a negative charge of 1.6 x 10^-19) How much total charge is contained in the beam? How quickly are these particl...

**PHYSICS**

At he lowest point in its swing, a 2.5 kilogram pendulum bob has 40 joules of kinetic energy. How high will it swing when it reaches the highest point in its swing? 40/2.5 x 9.8 = 1.63 joules

**PHYSICS**

A cylinder contains 0.1 cubic meters of gas at atmospheric pressure. This gas is allowed to expand until its pressure drops to 7800 Pa. What is the gas volume after this expansion has taken place? answer: 7800/10130 = 0.770

**PHYSICS**

A person heats up a can of soup on a stove. If he does 250 joules of work on the soup by stirring it as the burner adds 1675 joules of heat, what is the change in its internal energy? I took 1675j - 250 j = 1425j

**PHYSICS**

You are using a hydraulic jack to lift a 12000 Newton object. This input piston of your jack has a radius of 0.85 meters and you can exert a maximum of 3500 Newtons on it. How large does the radius of the output piston need to be in order to lift this object without failing?

**PHYSICS**

A cylinder contains 0.1 cubic meters of gas at atmospheric pressure. This gas is allowed to expand until its pressure drops to 7800 Pa. What is the gas volume after this expansion has taken place?

**PHYSICS**

Identify the following gas compression descriptions as adiabatic, isothermal or isobaric. a. As the gas compresses, the internal energy ÄU, decreases when the temperature decreases; the work done on the gas is greater than the heat removed from the gas: __________________...

**Physics**

A person heats up a can of soup on a stove. If he does 250 Joules of work on the soup by stirring it as the burner adds 1675 Joules of heat, what is the change in its internal energy?

**Physics**

A lukewarm bottle containing 800 grams of water is placed in a refrigerator. How many calories of heat must be removed from the water to chill its temperature from 55 C to 4 C?

**Physics**

An unknown substance is found to require a very large amount of heat energy to raise its temperature a single degree. Does it have a high specific heat capacity or a samall specific capacity? Explain

**PHYSICS**

A toy gun launches a small plastic sphere using a spring. The spring has a spring constanct of 20 J/M^2 and the plastic sphere has a mass of 25 grams. Before launch x initial is -10cm velocity initial is 0 m/s After launch x final is o cm Apply the law of conservation of energ...

**PHYSICS**

A toy gun launches a small plastic sphere using a spring. The spring has a spring constanct of 20 J/M^2 and the plastic sphere has a mass of 25 grams. Before launch x initial is -10cm velocity initial is 0 m/s After launch x final is o cm Identify the known quantities and thei...

**PHYSICS**

A toy gun launches a small plastic sphere using a spring. The spring has a spring constanct of 20 J/M^2 and the plastic sphere has a mass of 25 grams. Before launch x initial is -10cm velocity initial is 0 m/s After launch x final is o cm In order to determine the speed of the...

**PHYSICS**

a 1500kg sports car accelerates from 0 to 30 m/s in 8 seconds. Whaat is the power of its engine?

**PHYSICS**

A 7 kilogram bowling ball is dropped from a fourth story window. If each story is 3 meters high, use energy conservation (not the equations of motion) to find the ball's velocity when it strikes the ground. Ignore air resistance. Thank you

**PHYSICS**

A 25,000 kilogram train is traveling down a track at 20 meters per second. A cow wanders onto the tracks 75 meters ahead of the train, causing the conductor to slam on the brakes. The rain skids to a stop. If the brakes can provide 62,500 Newtons of friction, will the conducto...

**PHYSICS**

Consider a spring and block system k= 18 N/m x initial = o m x final = 0.08m Useing Hooke's law to calculate the force needed to stretch this spring 8 cm.

**PHYSICS**

A 25,000 kilogram train is traveling down a track at 20 meters per second. A cow wanders onto the tracks 75 meters ahead of the train, causing the conductor to slam on the brakes. The rain skids to a stop. If the brakes can provide 62,500 Newtons of friction, will the conducto...

**Physics**

A hot air balloon is hovering at an altitude of 6000 meters. The pilot decides that it is time to descend and turns off the balloon's burners. Once the balloon reaches the ground, the gas inside the balloon occupies 980 m^3 and is at atmospheric pressure. If the pressure o...

**Physics**

A hot air balloon is hovering at an altitude of 6000 meters. The pilot decides that it is time to descend and turns off the balloon's burners. Once the balloon reaches the ground, the gas inside the balloon occupies 980 m^3 and is at atmospheric pressure. If the pressure o...

**Physics**

A 9000 Kiogram boat floats in a lake. If half of the boat is submerged, which of the following is true: 1. The boat is less dense than the water in the lake. 2. The buoyant force is less than half the weight of the boat. 3. The buoyant force is greater than the total weight of...

**Physics**

When altitude increases, pressure decreases and density decreases. Is this true in a statement descrbing the relationship between the three?

**Physics**

A man and a woman are walking across soft ground. The woman wears stilettos; each heel has a cross-sectional area of 0.95cm^2 (0.000095m^2) The man wears a flat shoe with a heel area of 110cm^2 (or 0.011m^2) 1. If the woman weighs 520 Newtons, how much pressure does she exerts...

**Physics**

A hydraulic jack is used to move an 8896 Newton car. If the area of the output piston is 8 times that of the input piston, how much input force is required to lift the the car? Is this where I do P=PA or F1(A2)/F2 = A1(f2)/F2 F1 = A1F2/A2 Please help set this up. F2=8896 A1=8 ...

**PHYSICS**

A 650 newton skydiver jumps out of a plane at an altitude of 5000m. 8 seconds after he stops accelerating, he is moving at 50m/s. How large is the air resistance acting against him? less than 650n Equal to 650 N Greater than 650N Is this enought information to answer this?

**PHYSICS**

A 578 Newton person takes an elevator from the first floor to the second floor of a building. The elevator quickly accelerates at a rate of 1.1 m/s^2 and then moves at a constant speed. Find the passenger's apparent weight during this period of acceleration. (578N)(9.8)=56...

**PHYSICS**

Let say I have a chandelier that hangs from the ceiling. My chandelier weighs 75kg, how much tension is in the cable that connects it to the ceiling? what is the formula for this and how do I figure out the tension?

**PHYSICS**

Not sure how to set this one up. An object of unknown mass receives a 25 Newton force and accelerates at a rate of 0.55 m/s^2. What is its mass in kilograms?

**PHYSICS**

A pebble is tossed off a skyscraper and reaches the groung 7.65 seconds later. How tall is this building? 7.65 s x 9.8 m/s^2 = 74.97 meters????? Not sure if I did this right? Thanks

**PHYSICS**

A dog escapes from his front yard at 3.15 p.m. and is discovered 3.5 miles from home at 4:50 p.m. What is the dog's average speed in miles per hour? Please let me know if this is correct, if is not, let me know what I did wrong. speed=d/time of travel 3.5/1.35 = 2.59 m/h

**PHYSICS**

HOW DO YOU FIGURE OUT A VALUE OF ACCELERATION? CAN IT BE THE SAME AT TWO DIFFERENT TIMES?

**PHYSICS**

Please help and let me know if I did something wrong. If a cart is released from rest at a 10 meter incline and takes 28 seconds to travel down this incline. 1. Calculate the average speed of the cart? I wrote s=ad/at=10m/28 sec = 357 m/s 2. calculate the instantaneous velocit...

**PHYSICS**

If a cart is released from rest at a 10 meter incline and takes 28 seconds to travel down this incline. 1. Calculate the average speed of the cart? 2. calculate the instantaneous velocity of the cart at the end of the 10 meters(this value should be twice the value in question ...

**PHYSICS**

If a cart is released from rest at a 10 meter incline and takes 28 seconds to travel down this incline. 1. Calculate the average speed of the cart? 2. calculate the instantaneous velocity of the cart at the end of the 10 meters(this value should be twice the value in question ...

**PHYSIC**

A PLANE IS TRAVELING AT 90 MILES PER HOUR DUE SOUTH. WHAT DO WE KNOW ABOUT IT? 1. ITS SPEED 2. ITS VELOCITY 3. BOTH ITS SPEED AND ITS VELOCITY

**PHYSIC**

THE MOON ORBITS THE EARTH AT A SPEED OF 1.02 KILOMETERS PER SECOND. USE DIMENSIONAL ANALYSIS TO CONVERT THIS SPEED INTO MILES PER HOUR.

**PHYSIC**

A CHEETAH CAN ACCELERATE AT A RATE OF 8.0 M/S^2. ASSUMING IT STARTS FROM REST, WHAT WILL ITS VELOCITY BY AFTER 3.5 SECONDS?

**PHYSIC**

A SKATER IS ROLLERBLADING DOWN A SIDEWALK AT A VELOCITY OF 2.7 M/S. AS SHE APPROACHES AN INTERSECTION, SHE SLOWS TO A STOP OVER A 5.8 SECOND PERIOD. WHAT IS HER AVERAGE ACCELERATION?

**physic**

a car sits still at a red light. once the light turns green, the driver accelerates at a rate of 3.5 m/s^2. how far has the car moved after 6 seconds?

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