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How many calories of heat need to be extracted from 200.g of steam at 120.°C to change it into ice at --12.0°C ?
When you are in an elevator, you feel lighter while accelerating downward. The sensation of weight depends on what force?
a. actual weight
b. tension
c. normal force
d. friction
You slide an 800 N table across the kitchen floor by pushing with a force of 100 N. If the table moves at a constant speed, the friction force with the floor must be
a. 800 N.
b. greater than 100 N but less than 800 N.
c. greater than 800 N.
d. 100 N.
1.) To keep a car on track around the curve during the course of a turn, the car doubles its speed. What is the frictional force must the tires provide?
a. quadruple
b. double
c. 1/2 as big the previous force
d. 1/4 as big the previous force
A box is initially at rest on a smooth incline. If an external force is applied upward, the box will be
a. sliding upward
b. sliding up and down the incline
c. stationary
d. sliding downward
Copper has a density of 9 g/cm3 and a bulk modulus of 1.2 x 1011 N/m2. What is the speed of a wave through it?
A molecules pf oxygen possess a charges of -2C and 2C separated from a distance of 0.2.Calculate the dipole moment in this conditiom
A constant force on 40n act on a body initially at rest give it an acceleration of 0.1mls for 4seconds.calculate the work done by the force
A proton (+q) is 50nm away from an electron (-q) which is 30nm away from another proton (+2q) with
a charge +2q. What is the net electric force on +2q?
How important is following the procedures in operating volmeter and ammeter properly?
