03/07/16

Solving for Centripetal Force using an Free Body Diagram
Gabriella (75  kg) rides a roller coaster. What is her acceleration at the top of the vertical loop if she feels like her weight is 1200N?   What is Gabriella's acceleration at the... more
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03/01/16

CHEMISTRY PROBLEM: In how many of these cases does the internal energy of the system decrease? Consider the following four cases A chemical process in which he
CHEMISTRY PROBLEM: In how many of these cases does the internal energy of the system decrease?Consider the following four casesA chemical process in which heat is absorbed.A change in which q=30 J,... more
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02/29/16

Please help
The expression pi(r-3)^2 represents the area covered by the hour hand on a clock in one rotation, where r is the radius of the entire clock. Write a polynomial in standard form that represents the... more
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02/29/16

Projectile and velocity
The range of a projectile fired at an angle theta with the horizontal and with an initial velocity of v0 feet per second is r = 1/32v0^2 sin 2theta, where r is measured in feet. Determine the... more
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02/28/16

AtWhatDistanceDoesTheElectricFieldProducedByAChargeOf-11µC HaveAMagnitudeEqualTo9.3x10^4 N/C
Physics question
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02/27/16

A 1500 W kettle warms 1.00 kg of water from...
A 1500 W kettle warms 1.00 kg of water from 18oC to 88oC in a time of 3.6 min. How efficient is the kettle? Answer: 91%
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02/27/16

A 5.0 g air pellet is fired into a 495 g sandbag, which is suspended by a string to form a pendulum. If the 200 m/s....
A 5.0 g air pellet is fired into a 495 g sandbag, which is suspended by a string to form a pendulum. If the sandbag plus the imbedded pellet move off at 2.0 m/s immediately after the pellet hits... more
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02/25/16

A 100 g rubber ball is thrown down at 4.0 m/s ...
A 100 g rubber ball is thrown down at 4.0 m/s from a height of 2.5 m. If the ball bounces to a height of 2.7 m, calculate the efficiency. Answer: 81%
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02/25/16

safe landing speed for an aircraft with a gross weight of 9000 pounds and a wing surface area of 225 surface feet, when the coefficient of lift is 2.8
Math 3 radicals , polynomials, 
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02/24/16

A car of 1200 kg is travelling at 20 m/s...
A car of 1200 kg is travelling at 20 m/s when it slams on the brakes.a. How much kinetic energy does the car have before it hits the brakes? b. Where does this energy go when the driver brakes to... more
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02/24/16

A girl runs at top speed (5.0 m/s) and grasps a 4.0 m rope...
A girl runs at top speed (5.0 m/s) and grasps a 4.0 m rope hanging vertically from a tall tree at the edge of a lake. a) How high can she swing upward? b) Does her mass affect the answer? c)... more
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02/24/16

Help with maths question
A spherical party ballon is blown up to help decorate a room.  Find the volume of air, correct to 2d.p. Need for the ballon to be: a)10cm wide  b)20 cm wide  c)30cm wide 2) if the ballon pops... more
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02/23/16

What is the volume of the gas at the lower temperature?
A weather balloon containing helium with a volume of 410 L rises in the atmosphere and is cooled from 27 degrees celsius to -27 degrees celsius. The pressure is reduced from 110 KPA to 25 KPA.
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02/22/16

The average rate of travel of some car over a 6 mile stretch of divided highway is 58 mi/hr
What can be said about the speed of the car at the 3 mile point    A speed= 58 mi/hr B. speed < 58 mi/hr C. speed > 58 mi/hr
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02/21/16

I need help on this one
Assume that most of the electromagnetic energy from the sun is the visible region near 500 nm. Calculate the maximum value of the work function for a metal to be used in photovoltaic cells to... more
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02/20/16

2 cities are 41.2 km apart. vehicla A leaves one city at the same time Vehicle B leaves the other. Find the speed of Vehicle A if it travels 7.80 km/h faster
than Vehicle B. determine if they will pass eachother in 12.9 minutes. round to 3 significant digits
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02/15/16

could someone help me with math?
Apply the distributive property (assume all variables are non zero): k^2(1−10/k^2)
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02/15/16

pressure, physic
A tank has a diameter of 19.2ft and a liquid height of 12.4ft. The tank contains a fluid with a specific gravity of 1.4, a temperature of 85.4ºF, and a density of 87.36lb/ft3. What is the pressure... more
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02/12/16

time period of oscillation & wavelength of disturbance
If the velocity of a disturbance in a steel rod is 2000 m/s & the frequency of vibration is 2000 Hz, find a) the time period of oscillation of each particle of the rod b) wavelength of the... more
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02/12/16

phyics question below
A small cork with an excess charge of +7.0 µCis placed 0.24 m from another cork, whichcarries a charge of −3.2 µC.What is the magnitude of the electric forcebetween the corks? The Coulomb constant... more
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02/09/16

Newton's first law of motion states that the velocity of an object doesn't change if the forces acting on the object are what
Were would be the best place to find the answer to this question.
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02/04/16

in 1989 the average price of a gallon was 0.93 cents. in 2007 the average price of a gallon was 2.77. find the percent change.
in 1989 the average price of a gallon was 0.93 cents. in 2007 the average price of a gallon was 2.77. find the percent change.  
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02/03/16

Physics Help Please!
1. If the distance between two electric charges doubles, then the force they exert on each other changes by how much? (a) 4 times as big (b) 2 times as big
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02/03/16

Chemistry help
several isotopes of curium can be synthesized by bombarding 239 Pu with alpha particle. Write a balanced nuclear equation describing the reaction that produces 241Cm.
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02/01/16

calculate the drag force experienced by a lorry with motive power of 288KW moving at a constant speed of 31 m/s
i need a meduim size detail info about my question to solve for my answer sheet
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