Can someone please send me class 9 science work and energy and soung tough numericals please.........
Answers
Explanation:
Question 1.
A light and a heavy object have the same momentum. Find out the ratio of their kinetic energies. Which one has a larger kinetic energy?
Question 2.
An object with 100 N weights is raised to a height of 15m. Find the potential energy possessed by the object at that height. Also find the new potential energy:
a.If the same object is raised half of its original height.
b.If the same object is raised to three times of its original height?
Given g=10m/s2
Question 3.
Define one joule of kinetic energy?
Question 4.
A ball of mass 2kg is thrown up with a speed of 10m/s. find the kinetic energy of the ball at the time of throwing. Also find the potential energy of the ball at the highest point?
Question 5.
An object of mass m and velocity v has kinetic energy= 200J. Find the new kinetic energy if the mass of the object becomes double and velocity still remains the same?
Question 6.
Calculate the kinetic energy of a car of mass 500kg moving with a velocity of 36km/h. Find the kinetic energy if the velocity of car doubles?
Question 7.
Calculate the power of an electric motor that can lift 800 kg of water to store in a tank at a height of 1500cm in 20s. (g=10m/s2).
Question 8.
Calculate the electrical energy consumed in Joules if a toaster of 60 W is used for 30 minutes?
Question 9.
An electric heater of 1000 W is used for two hours in a day? What is the cost of using it for a month of 28 days, if one unit costs 3.00 rupees?
Question 10.
What energy transformation takes place in :
a.Dry cell
b.electric fan
all the best
Answer:
A light and heavy object have the same momentum find out the ratio of their kinetic energies .which one has a larger kinetic energy ?