Answer:
B. for an object that floats
Explanation:
For an object to float the weight of the object must be balanced by the buoyancy force.
However an object will sink if the magnitude of the buoyant force is equal to the weight of the amount of fluid that has the same volume as the object.
Answer:
Explanation:
(a)
Magnitude of 
= 
= 4.47 m
Let θ be the direction of vector D
θ = 63.44°
(b)
Magnitude of 
= 
= 8.485 m
Let θ be the direction of vector D
θ = 135°
The freezing point ..... :)
Answer:
Below
Explanation:
The cars upward accel adds to the gravity accel (think about how suddenly heavy you feel when the elevator starts to move upward)
F = tension = ma
= 1400 * ( .7 + 9.81) = 14714 N
Classical physics considered light to behave as a wave in all environments; it had a set amplitude, frequency etc. The problem was that this meant that there was a continuous variation in its properties, hence if the amplitude of the light was incresed by a bit, a phenomenon like the phhotoelectric one would become only marginally more apparent. However, in this case, there is a cutoff point which means that the only-wave theory had to be wrong.
