Answer: when an object begins to fall its potential energy decreases and it’s kinetic energy increases, potential energy is equal to kinetic energy because a decrease in potential energy is exactly equal to the increase in kinetic energy.
Answer: 650-845
Explanation: Most sources state that there are over 650 named skeletal muscles in the human body, although some figures go up to as many as 840. The dissension comes from those that count the muscles within a complex muscle.
Answer:
(a) θ = 20°
(b) Time Delay = 2.84 s
Explanation:
(a)
This is the case of the projectile motion. In projectile motion, for the same launch speed, the range of a projectile is the same for the complimentary launch angles. Hence, the snowball will have the same range when launched at 70°, at an angle of:
<u>θ = 20°</u>
<u></u>
(b)
The time of flight of snowball can be found by the following formula:
where,
T = Time of flight = ?
u = launch speed = 23.3 m/s
g = acceleration due to gravity = 9.81 m/s²
For θ = 70° :
T₇₀ = 4.46 s
For θ = 20° :
T₂₀ = 1.62 s
Therefore, the time delay can be calculated as follows:
<u>Time Delay = 2.84 s</u>
Answer:
<h3>The answer is 2122.73 g</h3>
Explanation:
The mass of a substance given it's molar mass and number of moles can be found by using the formula
mass = Molar mass × number of moles
From the question
molar mass = 283.03 g/mol
number of moles = 7.5 mol
So we have
mass = 283.03 × 7.5 = 2122.725
We have the final answer as
<h3>2122.73 g</h3>
Hope this helps you