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Answer:
The least number of forces required to stretch a spring is one.
Explanation:
Let suppose that spring is ideal, that is, that effects from its mass can be neglected since it is insignificant in comparison with external forces. In addition, let the spring have a linear behavior, meaning that net external longitudinal force exerted on spring is directly proportional to defomation. (Hooke's Law) That is:
(1)
(2)
Where:
- Net external force, measured in newtons.
- Spring constant, measured in newtons per meter.
- Deformation of spring, measured in meters.
Hence, the least number of forces required to stretch a spring is one.
Answer: D. Time and length
Explanation.
Time is always measured relative to some reference time, so it is relative.
Mass is the matter that defines an object. It could be converted into energy but its quantity does not change, so it is not relative.
Length is a measurement that is compared against a standard, so it is relative.
Answer:
350 J
Explanation:
Q = Input heat of the steam engine = 2750 J
H = Heat energy given of to the surroundings = 1500 J
W = Work done by the system = 850 J
The energy which the system possesses is known as internal energy
Change in internal energy is given by
The change in internal energy of the system is 350 J