Answer:
does work have to be done to hold the object in place
B. located in the atom's nucleus.
Explanation:
Rutherford's experiment using a beam of alpha particles aimed at a sheet of gold foil led him to conclude that an atom's mass is located in the atom's nucleus.
- In his experiment, he bombarded a thin gold foil with alpha particles.
- He found that most of the alpha particles passed through the foil while a few of them were deflected back.
To explain this, he suggested an atomic model(nuclear model) in which an atom is made up of a small positively charged center or nucleus.
The mass is concentrated in the nucleus.
A large space containing electrons further surrounds the nucleus.
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Answer:
electromagnetic energy uses magnets to form energy they change the magenet because magnets without a electric current dont create energy
Explanation:
Answer:
(a) Option B
The magnitude of the buoyancy force is equal to that of the ball's weight.
(b) Option B
The magnitude of the buoyancy force is larger than that of the ball's weight.
(c) Option B
They both have the same buoyancy force.
Explanation:
(a)
Ball 1
The sum of vertical forces is zero hence therefore
B-mg=0 where B is buoyancy force, m is mass of ball, g is acceleration due to gravity
B=mg
mg is weight of ball
Therefore, option B, The magnitude of the buoyancy force is equal to that of the ball's weight
(b)
Ball 2
The sum of vertical forces is zero hence therefore
B-T-mg=0 where B is buoyancy force, m is mass of ball, g is acceleration due to gravity and T is tension in the string
B=mg+T
Therefore, option B, The magnitude of the buoyancy force is larger than that of the ball's weight.
(c
)
Ball 2 and 3
They have similar buoyancy force since the weight displaced by the body equals the buoyancy force. In this case, the weight of the displaced fluid is proportional to the volume of the ball since the two balls have same volume. It therefore means that their buoyancy forces are also the same.