Answer:
16.1 m/s
Explanation:
We can solve the problem by using the law of conservation of energy.
At the beginning, the spring is compressed by x = 35 cm = 0.35 m, and it stores an elastic potential energy given by
where k = 316 N/m is the spring constant. Once the block is released, the spring returns to its natural length and all its elastic potential energy is converted into kinetic energy of the block (which starts moving). This kinetic energy is equal to
where m = 0.15 kg is the mass of the block and v is its speed.
Since the energy must be conserved, we can equate the initial elastic energy of the spring to the final kinetic energy of the block, and from the equation we obtain we can find the speed of the block:
Answer:
Oxygen and methane can react chemically with each other, so we would not see them together unless there are active sources for both. On Earth, biology is responsible for essentially all the oxygen and the majority of the methane in our atmosphere.
Answer: 0.42watts
Explanation:
Energy of the battery = 500 J
Time = 1200 seconds
Power of the instrument = ?
Recall that power is the rate of energy expended in doing work. Thus, power is energy expended divided by time taken.
i.e Power = (energy/time)
Power = 500J/1200 seconds
Power = 0.416 watts (Round to the nearest hundredth which is 0.42 watts)
Thus, the power of the instrument is 0.42watts
The mass of the car [m] = 1.2×10^3 kg.
The initial speed of car[u]= 0 m/s
The final speed of car [v]= 20 m/s
We are asked to calculate the force required to increase the speed from 0 to 20 m/s.
The momentum of a substance is defined as product of mass and velocity.
Mathematically momentum p=m×v [Here m is the mass]
From Newton's second law we know that-
[here t is the time]
[ANS]
Hence the correct answer to the question is C.
