01/26/17

Find the x-component of vector a⃗ = (7.0 m/s2 , −y-direction).
Can you you show me the steps to solve this kind of problem.  
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01/25/17

A girl is given a lift on the back of a bicycle by a boy. They then travel together.
The girl wishes to get off the bicycle while its still moving. She knows that if she puts her feet on the ground and stand up that she's likely to fall. Explain using physics principles why she is... more
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01/21/17

An example of stimulus discrimination in classical conditioning is:_______________

A. After an accident with a red car last month, Giorgio gets nervous when he sees a red car, but not when he sees a red truck or van.     B. Hank thinks all elderly drivers are slow and leave... more
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01/13/17

A pendulum swings from the vertical through an angle of 15◦ on each side of the vertical...
A pendulum swings from the vertical through an angle of 15◦ on each side of the vertical. If the pendulum is 90 cm long, what is the distance, x cm, between its highest and lowest points?
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01/13/17

If an astronaut weighed 175 pounds on Earth, he would have weighed only 29 pounds on the moon. If his mass was 80 kg on Earth, what would his mass have been on
Full Question: If an astronaut weighed 175 pounds on Earth, he would have weighed only 29 pounds on the moon. If his mass was 80 kg on Earth, what would his mass have been on the moon?   Topic:... more
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01/10/17

how do find ave net force?
a 45kg swimmer starting from rest can develop a maximum speed of 12 m/s over a distance of 20 m. how much net force must be applied to do this?
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01/08/17

If the refractive index of water is 4/3 and th fish is 12cm below the surface of water, find the radius of the circle.
A fish looking up through the water sees that the outside world is contained in a circular horizon. If the refractive index of water is 4/3 and th fish is 12cm below the surface of water, find the... more
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01/05/17

Motors and Generators
A 12V electric motor is turned on. When the motor is first started, the current is 1.0A. Once running, the current on the motor is 0.24A.a) What is the resistance of the motor?b) What is the... more
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01/02/17

Rotational physics problem
a 1.5kg uniform rod of length .75 meters swings from rest around an axis through its end through an angle of 60 degrees. It strikes the center of a small .25 kg ball which sits on the edge of a... more
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12/22/16

Terminal Voltage
A 1.5 V source has internal resistance of 1.0 Ω. What current must flow through the cell so that the terminal voltage is equal to the EMF?
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12/14/16

Physics Energy Maths simplifying
        How does the second line simplify to the third like REh seems to disappear
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12/13/16

Simple Harmonic Motion
Displacement where the kinetic energy and the potential energy are thesame in Simple Harmonic Motion.   I know We need to equate the 2 equations   1/2(mv2) = 1/2 kx2   I know the answer is... more
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12/13/16

Physics Guitar String problem
A guitar string of length 67 cm and mass per unit length 0.9 g m-1 vibrates at anunknown frequency and is to be tuned to a reference source of 270 Hz, which isachieved by altering the tension of... more
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12/08/16

need help with physics
In a slow-pitch softball game, a 0.200-kg softball crosses the plate at 20.0 m/s at an angle of 40.0° below the horizontal. The batter hits the ball toward center field, giving it a velocity of... more
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12/07/16

shortest stopping time- physics question. please help :)
A 0.066 kg egg is thrown at a sheet with a velocity of 20.9 m/s. The maximum force that the egg can experience without breaking is 22.4 N. What is the shortest stopping time the sheet can impart to... more
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12/07/16

How fast is Anissa going after 7 seconds when starting at rest?
Anissa rides her snowboard down a hill sloped at 25 degrees. The coefficient of kinetic friction between her snowboard and the snow is 0.15. If Anissa's mass is 55 kg, how fast is she going 7... more
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12/07/16

Physics Wave properties.
a)When a periodic wave excites a medium explain why the particles in the medium can have both velocity and acceleration? (4 marks)     b) What is the phase relationship between the velocity and... more
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12/07/16

Simple Harmonic question
A particle in shm has a time period of 4s. It takes time t1 to start from mean position and reach half of the amplitude.In another case, it takes a time t2 to start from extreme position and reach... more
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12/03/16

A 145g baseball has been thrown vertically upward at 15m/s and is now at the peak of its flight what would be the free body diagram
Need help with the question
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11/27/16

PHYSICS QUESTION
A single conservative force acting on a particle varies as vector F = (-Ax + Bx6)i hat N, where A and B are constants and x is in meters. Accurately round coefficients to three significant... more
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11/27/16

PHYSICS HELP PLEASE
When a 3.80 kg object is hung vertically on a certain light spring that obeys Hooke's law, the spring stretches 2.80 cm.   (a) If the 3.80 kg object is removed, how far will the spring stretch if... more
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11/18/16

A small 30kg child is on a merry-go-round that has a radius of 2000mm and a mass of 80,000 grams. If the merry-go-round is spinning at 12 rpm before the child h
A small 30kg child is on a merry-go-round that has a radius of 2000mm and a mass of 80,000 grams. If the merry-go-round is spinning at 12 rpm before the child hops on, what would be the new angular... more
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11/18/16

Momentum And Collisions 2
Calculate the magnitude of the linear momentum for the following cases.(a) a proton with mass 1.67 10-27 kg, moving with a speed of 4.00 106 m/s kg·m/s(b) a 17.5 g bullet moving with a speed of... more
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11/18/16

Momentum And Collisions
A ball of mass 0.120 kg is dropped from rest from a height of 1.25 m. It rebounds from the floor to reach a height of 0.600 m. What impulse was given to the ball by the floor? kg·m/s
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11/18/16

Work And Energy 8
If a projectile with a mass of 9.90 g is traveling at a speed of 1.23 km/s, determine the following.(a) kinetic energy of the projectile in kilojoules   kJ   (b) kinetic energy of the... more
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