The velocity of any object depends upon
2 answers:
Answer:
The displacement, the time and the direction
Explanation:
The velocity of an object is defined as:
where
d is the displacement, which is a vector describing the change in position of the object
t is the time in which the displacement takes place
Since d (the displacement) is a vector, velocity is a vector as well: this means that it also has a direction, which corresponds to the direction of the displacement.
The magnitude of the velocity, insteand, is called speed.
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Explanation:
An endothermic reaction is a type of of chemical reaction in which energy is absorbed from the surrounding. The temperature of the surrounding decreases.
An Exothermic reaction is a type of of chemical reaction in which energy is released into the surrounding. The temperature of the surrounding increases.
a)When an endothermic reaction takes place in test tube the temperature of the surrounding(here the outside wall of the test tube) will decrease which can be felt by touching the outside of the test tube.
b) Burning a candle
,Lighting a gas stove and running a car's engine all are example of exothermic reaction because energy is releases into surroundings. Where as using an instant cold pack is an example endothermic reaction in which energy is absorbed from the surrounding.
c) The diagram is of an exothermic reaction because the energy of the reactants is higher than the energy of the products.The difference in the energies of these two is the energy which was being released on completion of reaction.
Answer:
Mass, m = 4 kg
Explanation:
<u>Given the following data;</u>
Energy = 3.6 * 10^17 Joules
We know that the speed of light is equal to 3 * 10⁸ m/s.
To find the mass of the substance;
The theory of special relativity by Albert Einstein gave birth to one of the most famous equation in science.
The equation illustrates, energy equals mass multiplied by the square of the speed of light.
Mathematically, the theory of special relativity is given by the formula;
Where;
- E is the energy possessed by a substance.
- m is the mass.
- c is the speed of light.
Substituting into the formula, we have;
Mass, m = 4 kg
a) The launch velocity of the rocket is 5.48 m/s
b) The maximum height is 1.53 m
Explanation:
a)
We can solve this part by applying the law of conservation of energy, by considering the kinetic energy and the elastic potential energy only, since there is no change in gravitational potential energy and no friction is involved.
The total energy when the spring is compressed is:
with
(initial kinetic energy is zero)
is the elastic potential energy stored in the spring, with
k = 450 N/m (spring constant)
x = 0.10 m (compression of the spring)
The total energy when the spring is relased is:
with
(final kinetic energy), with
m = 0.15 kg (mass of the rocket)
v = velocity of launch of the rocket
(elastic potential energy is zero when the spring is released)
Combining the two equations we get
And solving for v,
b)
In this part instead we consider only the kinetic energy and the gravitational potential energy, since the spring is at rest so its energy is now zero.
The total energy at the launch is:
where
(initial kinetic energy), with
m = 0.15 kg (mass of the rocket)
v = 5.48 m/s (velocity of launch of the rocket)
(initial gravitational potential energy is zero)
The total energy at the point of maximum height is:
where
(kinetic energy is zero since speed is zero)
(final gravitational potential energy), with
m = 0.15 kg
(acceleration of gravity)
h = ? (maximum height)
Combining the two equations we find
And solving for h,
Learn more about potential energy and kinetic energy:
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