Which Richter magnitude range can be recorded by instruments but isn't felt? A. less than 2.9 B. 3.0 – 4.9 C. 5.0 – 5.9 D. 6.0 a
2 answers:
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1) Final kinetic energy of the cart: B) 50 J
2) Final speed of the cart: C) 3.2 m/s
3) Height reached along the ramp: A) 0.5 m
Explanation:
1)
We can solve this part of the problem by using the work-energy theorem, which states that the work done on an object is equal to the kinetic energy gained by the object itself. Mathematically:
where
W is the work done
is the final kinetic energy
is the initial kinetic energy
In this problem, the work done on the cart is
W = 50 J
And assuming it starts from rest, its initial kinetic energy is zero:
Therefore, the final kinetic energy is:
2)
The kinetic energy of an object is the energy possessed by an object due to its motion; it is calculated as
where
m is the mass of the object
v is its speed
For the cart in this problem, we have:
K = 50 J is its final kinetic energy
m = 10 kg is the cart
Therefore, solving the formula for v, we find its speed:
3)
We can think this problem in terms of conservation of energy. In fact, as the cart rolls up the ramp, its kinetic energy is converted into gravitational potential energy, which is given by
where
m is the mass
is the acceleration of gravity
h is the heigth of the cart
When the cart reaches the maximum height, all the kinetic energy has been converted into potential energy, so we can write:
Re-arranging,
And since we know the initial speed of the cart along the ramp,
v = 3.2 m/s
we can find the maximum height reached along the ramp:
Learn more about work, kinetic energy and potential energy:
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The correct answer is
A) true
In fact, the electrical force can be present only if the two objects have a net charge different from zero, because the electrical force is proportional to the value of the charges:
so, if they are neutral they cannot exert an electrical force between each other, because their charge Q is zero.
Viceversa, the gravitational force is always present when the objects have masses, since the force is proportional to the value of the masses:
so, even if the two objetcs are neutral, if they have mass, they exert a gravitational force to each other.
A) true
In fact, the electrical force can be present only if the two objects have a net charge different from zero, because the electrical force is proportional to the value of the charges:
so, if they are neutral they cannot exert an electrical force between each other, because their charge Q is zero.
Viceversa, the gravitational force is always present when the objects have masses, since the force is proportional to the value of the masses:
so, even if the two objetcs are neutral, if they have mass, they exert a gravitational force to each other.