09/09/16

Physics Hard question
Imagine that a sprinter accelerates from rest to a maximum speed of 10.8m/s in 1.8s. In what time interval will he finish the 100-m race if he keeps his speed constant at 10.8m/s for the last part... more
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09/08/16

Free fall word problem
A ball is thrown upward with an initial velocity of 19.6m/s.what is the max height the ball will reach before falling back down?   Just want to check if my answer is correct, I ended up with 19.6m
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09/07/16

Kepler's third law question
According to Kepler's Third Law, if the semi-major axis of an orbit increases by a factor of 4 (in other words, became 4 times larger), what would that indicate about the period of the... more
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09/07/16

Negative displacement
During class we used graphs to model displacement, and there were several questions regarding negative displacement. What is represented by stating "positive" or "negative" displacement? Could (and... more
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09/07/16

Why would the initial velocity of somethng NOT be zero?
I am guessing it has something to do forces but im not sure. 
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09/07/16

How to determine the maximum speed achieved by a motorcycle that accelerates from a standing start and comes to a complete stop after travelling 300m.
The motorcycle is capable of achieving a top speed of 180 kph from a standing start over a distance of 400m with a time of 13.5 seconds.in an emergency breaking situation the motorcycle requires a... more
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09/06/16

Find the course and speed made god if a vessel's speed through the water is 12 knots at 060 degrees and there is a current of 5 knots at 326 degrees
Find the course and speed made god if a vessel's speed through the water is 12 knots at 060 degrees and there is a current of 5 knots at 326 degrees
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09/05/16

Fluid mechanics
A water tank has a spigot near its bottom. If the top of the tank is open to theatmosphere, determine the speed at which the water leaves the spigot when the water level is 0.500 m above the spigot.
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09/05/16

The small piston of a hydraulic lift has an area of 0.20 m^2. A car weighing 1.20 x le N sits on a rack mounted on the large piston.
The large piston has an area of 0.90 m2. How large a force must be applied to the small piston to support the car?
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09/05/16

Fluid mechanics
The highest natural concentration of salts in water is found in the evaporating remnants of old oceans, such as the Dead Sea in Israel. Suppose a swimmer with a volume of 0.75m3 is able to float... more
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09/05/16

Fluid mechanics
The largest helicopter in the world, which was built in Russia, has a mass of 1.03 x 103 kg. If you placed this helicopter on a large piston of a hydraulic lift, what force would need to be applied... more
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09/05/16

Calculate the absolute pressure at an ocean depth of 1.00 x 10^3 m.
assume that the density of the water is 1.025 x 103 kg/m3 and that P 0 = 1.01 x 105 Pa.
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09/05/16

projectile problem
a stone is thrown vertically upward. given elevation of 50 m and initial velocity of 15 m/s   find:   a)maximum height b) time it took to reach maximum height c)velocity before it hits... more
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09/04/16

Free fall physics word problem
In an action movie, the villain is rescued from the ocean by grabbing onto the ladder hanging from a helicopter. He is so intent on gripping the ladder that he lets go of his broefcase when he is... more
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08/31/16

it is question of velocity and accerlation.
An insect crawls at a constant rate u along the spoke of a cart wheel of radius a,the cart moving with velocity v. Find the acceleration along and perpendicular to the spoke at time t.            ... more
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08/31/16

Can someone please help me with this question regarding hydrophobic molecules in water? CHEM/BIO- IM STUCK!!!
Which is the most accurate statement of the phenomenon underlying 'hydrophobicity', the clustering of oily molecules in the presence of water?Select one:a. it's all about size--oil molecules are... more
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08/31/16

value of magnetic field
A particle of mass m and charge q is dropped  from a height h . In whole space there exists a constant magnetic field B inside the plane . prove that the value of B in tesla should be 2 such that... more
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08/30/16

Chemistry/Biology Water Question. PLEASE HELP! IM STUCK
The 'Jesus lizard', so called because it can walk (OK, run) on water is described in the link below. If you were trying to catch one by changing the properties of a puddle in its path (to make the... more
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08/30/16

the blush green light reflected Off the Wall was created through what process
I'm doing physics homework 
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08/29/16

what does it mean if the wavelength is 0.3 m
Doing my science homework, but can't figure out this question; what does it mean if the wavelength is 0.3 m? 
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08/29/16

value of heat dissipiated
A parrallel plate capacitor of capacitance 0.1 μF . Its two plates are given charge 2μC and 1μC . Prove that value of heat dissipated(in μJ) after switch is closed is 5
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08/29/16

Submarines and pressure
An experimental research submarine with a volume of 15,000 liters has an internal pressure of 1.2 atm. If the pressure of the ocean breaks the submarine forming a bubble with a pressure of 250 atm... more
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08/29/16

Find two numbers such that their sum and their product is -1
Please, hurry up. I need it now??
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08/28/16

What takes more energy; a 100 lb. weight moving on a level plain 20 ft. versus a 100 lb. weight on a 30 % grade moving 20 ft.
A 100 pound gate moving on a level grade a distance of 20 feet. A 100 pound gate moving up a 30% slope a distance of 20 feet. Which one takes more power/energy?
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08/28/16

Spring rate vs acceleration of compression springs.
Imagine two old fashioned pin ball machines. If one uses a spring with a rate of 5 pounds per inch compressed 10 inches for a load of 50 lbs; and the other uses a spring with a rate of 10 pounds... more
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