Answer:
3000W
Explanation:
Given parameter:
Weight of safe = 2000N
Height of lift = 6m
Time = 4s
Unknown:
Power used by Rudolph = ?
Solution:
Power is the rate at which work is being done. It is expressed as:
Power = 
Work done = Weight x height = 2000 x 6 = 12000J
Power = 
= 3000W
Answer:
Explanation:
A )
The smallest tidal ranges are less than 1 m (3 feet). The highest tides, called spring tides, are formed when the earth, sun and moon are lined up in a row. This happens every two weeks during a new moon or full moon. Smaller tides, called neap tides, are formed when the earth, sun and moon form a right angle.
C ) The most extreme tidal range occurs during spring tides, when the gravitational forces of both the Moon and Sun are aligned (syzygy), reinforcing each other in the same direction (new moon) or in opposite directions (full moon).
Given: Velocity of light c = 3.00 x 10⁸ m/s
Frequency f = 7.65 x 10⁷/s
Required: Wavelength λ = ?
Formula: λ = c/f
λ = 3.00 x 10⁸ m/s/7.65 x 10⁷/s
λ = 3.92 m
Answer:
53.54 Kg
Explanation:
We know that kinetic energy is given by ![0.5mv^{2}[\tex] where m is mass and v is the speed.Let your speed be v and the speed of the friend will be 1.23vSince kinetic energy is the same then[tex]0.5\times84v^{2}=0.5m_u(1.23)^{2}\\\m_u=53.54 Kg](https://tex.z-dn.net/?f=0.5mv%5E%7B2%7D%5B%5Ctex%5D%20where%20m%20is%20mass%20and%20v%20is%20the%20speed.%3C%2Fp%3E%3Cp%3ELet%20your%20speed%20be%20v%20and%20the%20speed%20of%20the%20friend%20will%20be%201.23v%3C%2Fp%3E%3Cp%3ESince%20kinetic%20energy%20is%20the%20same%20then%3C%2Fp%3E%3Cp%3E%5Btex%5D0.5%5Ctimes84v%5E%7B2%7D%3D0.5m_u%281.23%29%5E%7B2%7D%5C%5C%5Cm_u%3D53.54%20Kg)
one example is sound waves.
