Molecules can be made of atoms of the same element only. different elements only. the same or different elements.
2 answers:
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Answer:
a)
b)
c) Therefore it is a nonconservative force
Explanation:
Distance traveled in one complete circular trip against friction
The force of friction is
The work of friction is the force of friction in the distance so
a).
b).
c).
Since the circle returns to its initial position in both cases and the work done by the friction force different in both cases, so the friction force does depend on the path;
Answer:
The kinetic energy of the car at the top of the hill is 140280 Joules.
Explanation:
Mass of the car, m = 620 kg
Speed of the car, v = 24 m/s
Height of the hill, h = 30 m
The engine can produce up to 144,000 J of work during that time, W = 144,000 J
We need to find the kinetic energy of the car at the top of the hill. It can be calculated using conservation of mechanical energy as :
So, the kinetic energy of the car at the top of the hill is 140280 Joules. Hence, this is the required solution.
Answer:
487.23 N/m
Explanation:
Given:
mass of metal sphere 'm'= 0.51kg
the spring stretches from 0.12 m to 0.23 m. Therefore,
= 0.12m and
= 0.23m
the speed of the sphere decreases from 6.7 to 3.3 m/s. Therefore,
= 6.7m/s and
=3.3m/s
In order to find spring constant, we apply law of conservation of energy. i.e
The change of the kinetic energy of sphere is equal to the change of potential energy of the spring.
So, Δ Δ
where,
Δ 1/2 m (
-
)²
Δ= 1/2 k (
-
)²
1/2 m (-
)² = 1/2 k (
-
)²
k= m [ (-
)²/(
-
)²
k= 0.51 [(6.7-3.3)²/ (0.23-0.12)²]
k= 487.23 N/m
Thus, the spring constant of the spring is 487.23 N/m