Answer:
Red ball
Explanation:
Two ball of equal mass when fall on the surface from the same height means that both balls have same potential energy.
when the ball collides with the floor both ball posses same velocity.
but according to the statement given that red ball rebounds higher position means that the change of the velocity of the red ball is more the blue ball.
so, the change in momentum of the red ball is more than the blue ball which means the impulse during collision of the red ball will be more.
Answer:
The reading of the experiment made in air is 50 g more than the reading of the measurement made in water.
Explanation:
Knowing that the density of lead is and the volume, we can calculate the true weight of the piece of lead:
When the experiment is done in air, we can discard buoyancy force (due to different densities) made by air because it's negligible and the measured weight is approximately the same as the true weight.
When it is done in water, the effect of buoyancy force (force made by the displaced water) is no longer negligible, so we have to take it into account.
Knowing that the density of water is 1 g per cubic centimeter, and that the volume displaced is equal to the piece of lead (because of its much higher density, the piece of lead sinks), we can know that the buoyancy force made by water is 50 g, opposite to the weight of the lead.
Now that we have the two measurements, we can calculate the difference:
The reading of the experiment made in air is 50 g more than the reading of the measurement made in water.
Answer:
B
Explanation:
there are three modes of heat transfer which are
- conduction
- convection
- radiation
Conduction is a mode of heat transfer in solid materials
Convection refers to a mode of heat transfer of fluids in motion.
Radiation occurs when heat moves as energy waves in form of infrared radiation. The energy from the sun reaches us by radiation.
From the list of options;
option A refers prevention of heat transfer by radiation
option B refers to noodles rising and falling in a poy of boiling water. The path which the noodles move shows the convective path of the fluid.
option C refers to heat transfer by conduction
Option D refers to oth convection and radiation as modes of heat transfer.
option B best describes heat transfer by convection