The correct answer is yes, the acceleration can be zero. We know that velocity is the derivative of position and acceleration is the derivative of velocity. Therefore, we are trying to determine if there is any nonzero velocity function that we can take the derivative of to get 0. Any velocity function that is a coefficient such as v(t)=5, would have an acceleration of 0 because the derivative of a constant is always 0.
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Answer: Astronauts only float around in the shuttle when they are outside the gravitational pull of the earth
Explanation: when astronauts takes off from the earth, they get to a point (space) where the earth's gravity can no longer pull them. At this state, they experience weightlessness because there is no gravity. Since there is no gravity to pull them down, hence they start floating.
Answer:
The bimetallic strip will bend to the iron's way since
When heated copper expands more than iron
Explanation:
bimetallic strips are temperature regulatory devices used to convert a temperature change into mechanical displacement.
It consists of two layers, usually iron and copper which layers are joined together to form the strip owing to the difference in the constants of expansion of the two materials, a flat strip will bend one way (toward the iron part) if heated. The linear thermal expansion coefficient relates the change in temperature to the change in a material's linear dimensions.
The velocity of the combined mass after the collision is 0.84 ms-1.
<u>Explanation:</u>
According to law of conservation of momentum, the change in momentum before collision will be equal to the change in momentum of the objects after collision in isolated system.
But as it is perfectly inelastic collision in the present case, the final momentum will be based on the product of total mass of both the object with the velocity with which the collision occurred. This form is attained from the law of conservation of momentum as shown below:
So as law of conservation of momentum,
Here = 3 kg and = 2 kg are the masses of objects 1 and 2, = 1.4 m/s and = 0 are the initial velocities of object 1 and object 2, and are the final velocities of the objects.
So after collision, object 1 get sticked to object 2 and move together with equal velocity = = . Thus the above equation will become,
So the final velocity is
Thus,
= 0.84 ms-1.