It takes about 7000 years for light from the eagle nebula to reach us on earth. using this information, and the speed of light g
1 answer:
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Answer:
Acceleration of the box is 4.9 m/s².
Explanation:
The free body diagram is shown below.
The weight of the body can be resolved into two mutually perpendicular components as shown. The force responsible for sliding motion of the box along the incline is due to acting along the incline.
Therefore, as per Newton's second law of motion,
Net force =
Now, net force acting along the incline is only
Therefore,
Now,
Therefore, the acceleration of the box is given as:
Acceleration of the box is 4.9 m/s².
Answer:
98 N
Explanation:
The weight of an object is given by:
where
m is the mass of the object
is the acceleration due to gravity
In this problem, the mass of the lemur is m=10 kg, so its weight is
Answer:
v = 6.3 m/s
Explanation:
- Since no significant air resistance exists, total mechanical energy must be kept constant at any time.
- At the top of the cliff, all the energy is gravitational potential energy, as follows:
- If we choose the ground level as our zero reference level for the gravitational potential energy, Ui is simply:
- Ui = m*g*h (1)
- At any height, the sum of the kinetic and the gravitational potential energy must be equal to (1).
- We know from the question, that at the point of interest, both types of energies must be equal each other, so we can write the following expression from (1):
- Dividing both sides by m, simplifying, and solving for v, we get:
- v = 6.3 m/s (with two significative figures)