A sample of a solid nonmetal is compared to a sample of a solid metal. Both samples have the same volume. What is the most likel
2 answers:
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Answer:
v'=0.83m/a and v=10.2m/s
Explanation:
The information that we have is:
The maximum height of the projectile is given by the equation
So, rearrange for the velocity,
Apply the conservation of momentum,
Then rearrange the recoil speed,
Answer:
Explanation:
Let assume that the solid cylinder rolls down a frictionless incline. The translational speed can be found by using the Principle of Energy Conservation and the Work-Energy Theorem:
The translational speed is:
Answer:
B) Tommy had a positive acceleration between noon and 12:30 pm.
Explanation:
Acceleration is defined as the rate of change of velocity:
where
v is the final velocity
u is the initial velocity
t is the time
In the problem,
- At noon, Tommy is walking at a velocity of 4 mi/h
- At 12.30 pm, Tommy is walking at a velocity of 6 mi/h
- A time of half an hour (0.5 h) passed between the two moments
So Tommy's acceleration is
and the acceleration is positive, since the velocity has increased.