10/20/16

Dynamics work and energy
why are there different formulas used for work-energy in dynamics?
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10/17/16

Child on a swing Physics problem
A 350-N child is in a swing that is attached to a pair of ropes 2 m long. Derive an algebraic expression for the thegravitational potential energy of the child–Earth system as a function of the... more
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10/16/16

Rotational acceleration Physics
One end of a cord is fixed and a small 0.250-kg object is attached to the other end,where it swings in a section of a vertical circle of radius 1.50 m as shown in the figure below. When θ =... more
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10/16/16

i found magnitude how do you find direction
A train slows down as it rounds a sharp horizontal turn, slowing from 83.2 km/h to 58.9 km/h in the 13.4 s that it takes to round the bend. The radius of the curve is 143 m. Compute the... more
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10/16/16

help!!! i dont get the last fewparts of the question
A fish swimming in a horizontal plane has velocity vi = (4.00 i + 3.00 j) m/s at a point in the ocean where the position relative to a certain rock is ri = (10.0 i + 4.00 j) m. After the fish swims... more
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10/16/16

answer please physics
What if the acceleration is not constant? A particle starts from the origin with velocity 2i m/s at t = 0 and moves in the xy plane with a varying acceleration given by vector a = (5√tj) m/s2,... more
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10/16/16

answer this please i need it by tomorrow i tried but i keep getting it wrong(physics)
A Coast Guard cutter detects an unidentified ship at a distance of 16.8 km in the direction 14.2° east of north. The ship is traveling at 22.5 km/h on a course at 38.9° east of north. The Coast... more
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10/14/16

Train velocity problems
a train is starting from rest moving with uniform velocity 3ms-1 after the max. velocity with retardation of 2ms-1 it came to rest time of journey 1m. find total distance travel by train ?
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10/14/16

Bank robbers have pushed a 1000kg safe to a 2nd story floor to ceiling window. They plan to break the window,then lower the safe 3.0mto their truck. Not being t
too clsver, they stack up 500kg of furniture , tie a rope between the safe and the furniture and place the rope over a pulley. Then they push the safe out the window. What is the safes speed when... more
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10/14/16

Projectile motion
a skateboarder rolls off a horizontal ledge that is 1.32 m high, and lands 1.88 m from the base of the ledge. What was his initial velocity?
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10/14/16

A 50N sofa is inclined on a ramp at 250. Both µk and µs are 0.6
a.) What is the smallest force parallel to the incline needed to keep the sofa from sliding down? b.) What parallel force is required to keep the sofa moving up the incline at a constant speed?c.)... more
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10/13/16

How do I find the average speed if I know the distance and the time
so the problem is this:    Starting at home, Jessica traveled uphill to the toy store for 12 minutes at just 10 mph. She then traveled back home along the same path downhill at a speed of... more
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10/12/16

A heat transfer question for the chemistry tutors
If I drop a hot solid of mass m1, specific heat c1, and temperature T1 in a cool liquid of mass m2, specific heat c2, and temperature T2, I know they will reach an equilibrium temperature T that... more
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10/10/16

A bug is swimming laps at constant speed around outside edge of birdbath with radius 30 cm. it takes 5 s to compete one lap.
A) find avg acceleration as it moves from top of the circle to bottom (12 and 6 on a clock)   B) the inst acceleration at (9pm) reference
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10/10/16

Kinematics physics
An object is projected vertically upwards with velocity u m.s-1 , T seconds later another object is projected vertically upwards from the same point and with the same speed. Find, in terms of u , T... more
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10/10/16

Important Kinematics Physics
a-  A particle is projected vertically upwards with initial speed u m.s-1 , after T s it reaches its greatest height , H m . Find , in terms of u and g, an expression for :   i - T              ... more
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10/10/16

Structure of atoms related doubt
Photon is incident have frequency 1×?10?^14 sec^(-1). Threshold frequency of metal is 5 × ?10?^13 sec^(-1).find kinetic energy of electron 2.electron in hydrogen atom jump from excited state n to... more
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10/10/16

Temperature related doubts
if a refrigerator works between the temperature 4c &30c and 600 calories of heat is released then how to calculate work in joules ?
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10/09/16

An exercise in Kinematics Mechanics
Trains A and B are travelling in the same direction on two parallel straight tracks , at the moment that A passes B , A is travelling at a constant 20 m.s-1 and B is travelling at 5 m.s-1 and... more
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10/09/16

An exercise in kinematics Mechanics
Clare is driving along a road in her car , with henry following 40 m behind his car, They are both travelling at a speed of 25 m.s-1. Clare spots a problem ahead and brakes to a halt with an... more
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10/09/16

PLEASE HELP ME SOLVE THIS QUESTION.
P is a point 10m from the bottom of a slope, A ball is rolled up the slope from P with as initial velocity of 8 m.s-1 , it undergoes a constant acceleration of -4 m.s-2   a-  i- How long does it... more
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10/09/16

complicated exercise in kinematics physics .
A car , C, travelling at constant speed u, passes a stationary police car , P , which immediately sets off in pursuit with acceleration a , find in terms of u and a , the greatest distance... more
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10/08/16

What is the ratio of the intensity of light emerging from the third polarizer, I3, to the intensity of light incident on the first polarizer, I0?
A beam of initially unpolarized light passes through a sequence of three ideal polarizers. The angle between the axes of the first and second polarizers is 16.9°, and the angle between the axes of... more
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10/08/16

What is the width of the slit?
Light of wavelength 603.0 nm is incident on a narrow slit. The diffraction pattern is viewed on a screen 70.5 cm from the slit. The distance on the screen between the third order minimum and the... more
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10/08/16

physics related numericals
a block of mass m is kept on horizontal turn table at distance r from centre of the table. coeff of friction b/w table & block is μ.now turn table starts rotating with angular acceleration... more
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