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A child weighs 15kg and slides with an initial speed of 1.5 m/s down a slide that is 4.0 m long as shown in the figure The slide makes a 40 angle with the horizontal. The child's speed at the bottom is 3.2 m/s i)What was the force of friction that the slide was exerting on the child?
ii) How much work did the friction do?
iii)How much work did gravity do?
iv)How fast would the child travel if friction was negligible ?
v) What is the child's horizontal component of velocity?
Two identical balls collide as shown in the figure above. Ball A has an initial speed of 2.0 m s−1 and Ball B is initially stationary.
After the collision, Ball B is moving at a speed of 1.6 m s−1 at an angle of 60° to the direction it was orginally travelling in.
What is the speed of Ball A after the collision? (to 2 s.f)
A person is pushing a sled along a horizontal surface. They exert a force of 200 N on the 75 kg sled. In addition a frictional force of 20 N acts on the sled.
What is the rate of acceleration of the sled? (in m s−2 to 2.s.f)
. A block slides down a ramp that has a length of 11.4 m. The block travels at a speed of 5.43 m/s at the bottom of the ramp and increased in temperature from 22.1°C to 22.3°C. The block is made of copper and has a specific heat capacity of 385 J/kg°C. What is the angle of the ramp?
A block on a ramp slides down a 6.28 m long ramp. The ramp has an angle of inclination of 38°. If the block starts from rest and the amount of energy lost due to friction along the ramp is 21.6m J, where m is the mass of the block, use energy concepts to determine how fast the block is going at the bottom of the ramp.
A 3.7 kg bird traveling 7.99 m/s 50.3 m off the ground swoops down to 8.13 m off the ground. At this point it is traveling 23.2 m/s. What amount of energy is lost to air resistance?
A child on a slide is traveling 1.02 m/s 2.10 m off the ground. How fast is the child going at the bottom?
a force p directed from point a to point b determine moment of force p about x axis and y axis if it produces a moment of 1000nm about z axis
A charged oil droplet of radius r = 1.5•10-6 m is prevented from falling under gravity by the vertical electric field between two large horizontal plates maintained at a separation of 20mm and a potential difference of 100 V. The density of oil is 920kg/m3.
a) Find the charge on the oil droplet (g = 9.81m/s2).
b) If the polarity of the plates is reversed what is the instantaneous acceleration of the droplet?
An electric charge of 2.10-3C at a point X in an electric field had electric potential energy of 4.10-2 J. It was moved to another point Y where it’s potential energy was 6.10-2J. What is the potential difference between X and Y and the electric field strength if the points X and Y and seperated by distance 0.25m?
