Answer:
D. All of the above
Explanation:
Newton's third law states that:
"when an object A exerts a force on an object B, object B exerts an equal and opposite force on object A. These forces are called action and reaction"
Let's analyze each situation:
A. when hitting a baseball with a bat --> we have two objects (the baseball and the bat), so we have a pair of forces: the action is the force exerted by the baseball on the bat, while the reaction is the force exerted by the bat on the baseball
B. walking --> in this case, the two objects we should consider are the man walking and the road: the action is the force exerted by the feet of the man on the road, while the reaction is the force exerted by the road on the feet of the man, which allows him walking
C. swimming --> in this case, the two objects we should consider are the man swimming and the water around him: the action is the force exerted by the body of the man on the water, while the reaction is the force exerted by the water on the body of the man, which allows him to swim.
So, all the three choices are correct.
The kinetic energy of a moving body can be determined from its mass and velocity of the body. The kinetic energy of 1.0-kg billiard ball that moves at 5.0 m/s is 12.5 J. Hence, option D is correct.
Kinetic energy is a form of energy generated in body by virtue of its motion. It is directly proportional to the mass and square of velocity of the body. The equation of kinetic energy is written as follows:
KE = 1/2 mv²
When a body starts moving its kinetic starts to increase while the potential energy drops out. However the total mechanical energy in the system will be conserved.
The mass of the billiard ball is given 1 kg and the velocity is 5 m/s. Then the kinetic energy of the ball is calculated as follows:
KE = 1/2 1 kg × ( 5 m/s )².
= 1/2 × 25
= 12.5 J.
Therefore, the kinetic energy of 1.0-kg billiard ball that moves at 5.0 m/s is 12.5 J. Hence, option D is correct.
To find more about kinetic energy, refer the link below:
#SPJ5
b. only within the moon’s umbra.
c. only within the moon’s penumbra.
d. only the dark side of Earth.
Answer:
b. only within the moon’s umbra.
Explanation:
Solar eclipse occurs when Moon comes between the Sun and the Earth in straight line and blocks the sunlight. A shadow of moon castes on the surface of the Earth. The region passing through the moon's umbra would view a total solar eclipse. The moon completely hides the surface of the sun. It would be visible to the people residing in the bright side of the Earth within the Umbra of the moon.
Answer;
A barrier, a surface or a boundary
Explanation;
Reflection is the property waves that occurs due to the bouncing back of a wave after it strikes a barrier.
Reflection involves change in direction of a wavefront at an interface between two different media such that the wavefront returns into the medium from which it originated. In other words, the direction of the wave changes when they bounce of a barrier or a surface.
B) They are absorbed
C) The change into P-waves
D) They change into L-waves
Answer:
B) They are absorbed
Explanation:
B is correct because S waves can only travel through solid materials. When they hit liquid materials they are absorbed in and undetectable.
Answer:
B) They are absorbed
Explanation:
When they hit the liquid core, S-waves are no longer able to be detected. While P-waves bounce off the liquid core, S-waves are absorbed at the core.
sodium in the salt molecules
hydrogen in the water molecules
water
salt is the solute in that situation