07/04/16

Find the type of motion in the following case
a) A car travelling along a straight road, changes its speed.b) An athlete running a 100m race.c) Moon revolving around the earth.d) An Ant moving on the floor.
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07/03/16

Word Problems
Slowly Katie peeked around the door. the huge monster wiped its mouth, smiled, went to sleep, and started to snore. Katie had been watching while the monster ate the cakes in the bakery. The first... more
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07/03/16

On turning a corner, a motorcyclist rushing at 44 ms-1 finds a child on the road 100m away. He applies
On turning a corner, a motorcyclist rushing at 44 ms-1 finds a child on the road 100m away. He applies the brakes so as to stop the motorcar within with in 1 m of the child. Calculate the time... more
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07/03/16

A ball thrown vertically upwards with a speed of 19.6 ms-1 from the top of a tower returns to earth in 6s. Calculate the height of the tower.
How do we have to solve this question?
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07/02/16

A scooter can produce a maximum acceleration of 5m/s2.Its brakes can produce a maximum retardation of 10m/s2 .
A scooter can produce a maximum acceleration of 5m/s2.Its brakes can produce a maximum retardation of 10m/s2 . Find the maximum time in which it starts from rest, covers a distance of 1.5 Km and... more
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05/25/16

I know that they repel but I don't get the work done and energy conversion
Two positive charges are brought closer together. Describe the work done and the energy conversion that occurs.
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04/26/16

The force of gravity on a wooden crate is 500.0 N. If it requires ...
The force of gravity on a wooden crate is 500.0 N. If it requires 1.5 x 103 J of work to push the crate at steady speed along the floor for a distance of 5.0 m, what is the coefficient of friction... more
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04/21/16

Heat transfer between metal and water, what amount of water is boiled?
You place a very hot piece of aluminum (T=120 degrees C, c=900 J/(kg*degrees C) into a 500ml beaker of water that is already at an initial temperature of 90.0 degrees C. The mass of this piece of... more
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04/15/16

A double-paned window has two glass panes separated by a layer of air. Why is air, rather than glass, used to fill this space? HELP PLEASE!!!!!!!!!
  A. The conduction of heat is slowed by the air. B. The convection of heat is increased by the air.   C. The radiation of heat is increased by the air. D. The convection of heat is slowed by... more
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04/15/16

What is the main way in which heat transfer occurs in liquids and gases? HELP NEEDED!!!!!
A. Through electromagnetic waves B. Through sound wavesC. Through particles that bump into each other D. Through particles that move past each other
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04/14/16

pysics rotational motion
concrete mixture is made by mixing cement,stone and sand in a rotating cylindrical drum.if the drum rotates too fast,the ingredients remain stuck to the wall of the drum and proper mixing of the... more
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04/13/16

physics numercial question form SOUND
a toy car blowing its horn is moving with a steady speed of 5 m/s away from a wall.an oberver towards whom the toy car is moving is able to hear 5 beatsper second.if the velocity of sound in air is... more
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04/11/16

problem about interference - waves
You have two vibrating objects in an infinitely large pool. The distance between them is 6.0 m. Their frequency of vibration is 2.0 Hz and the wave speed is 4.0 m/s. The vibrations are sinusoidal.... more
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03/07/16

Solving for Centripetal Force using a Free Body Diagram
A 70 kg student is riding a roller coaster and is at the top of the vertical loop. The loop has a radius of 16 m, and the car's velocity at the top is 12 m/s. What is the student's apparent weight... more
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03/06/16

What is the difference between angular velocity and angular frequency?
And when are they considered the same?
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02/27/16

A 100 g rubber ball is thrown down at 4.0 m/s from a height...
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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06/09/15

physics help needed please..
A boat is moving due east where the earths magnetic field is 5.0 X (10 ^-5 ) N/Am due north and horizontal .The boat carries a vertical aerial 2 metres long. if the speed of the boat is 1.5 m/s.... more
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10/26/14

What happens to the change carrier density
If the current carried by a conductor is doubled what happens to  a)the charge carrier density  b)the current density  c)the electron drift velocity  d)the average time interval between... more
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