Answer:
Explanation:
The dart will go forward horizontally with velocity of 19 m/s. It will also fall downwards with initial velocity of zero and gravitational acceleration of 9.8 m/s².
Distance PQ covered by the dart can be calculated using the following formula.
s = ut + 1/2 at²
u is initial velocity , a is acceleration and t is time.
Putting the values
s = 0 + 1/2 x 9.8 x .19²
= .1769 m
= 17.69 cm.
Answer:
Time period, T = 403.78 years
Explanation:
It is given that,
Orbital distance,
Mass of the Earth,
Mass of the planet,
Let T is the orbital period of this planet. The Kepler's third law of motion gives the relation between the orbital period and the orbital distance.
or
T = 403.78 years
So, the orbital period of this planet is 404 years. Hence, this is the required solution.
Answer:
It's A
Explanation:
sound waves are longitudinal they need a medium to travel through
There are many factors that increase the rate of reaction like concentration of reactants, atmosphere, presence or absence of catalyst, nature of reactants etc.
The factor usually does not increase the rate of reaction is lowering the temperature. But if we increase the temperature during reaction may be it increase the rate of reaction.