Answer:
(A) 9.5 m/s
(B) 5.225 m
Explanation:
vertical height (h) = 4.7 m
horizontal distance (d) = 9.3 m
acceleration due to gravity (g) = 9.8 m/s^{2}
initial speed of the fish (u) = 0 m/s
(A) what is the pelicans initial speed ?
- lets first calculate the time it took the fish to fall
s = ut +
since u = 0
s =
t =
where a = acceleration due to gravity and s = vertical height
t = = 0.98 s
- pelicans initial speed = speed of the fish
speed of the fish = distance / time = 9.3 / 0.98 = 9.5 m/s
initial speed of the pelican = 9.5 m/s
(B) If the pelican was traveling at the same speed but was only 1.5 m above the water, how far would the fish travel horizontally before hitting the water below?
vertical height = 1.5 m
pelican's speed = 9.5 m/s
- lets also calculate the time it will take the fish to fall
s = ut +
since u = 0
s =
t =
where a = acceleration due to gravity and s = vertical height
t = = 0.55 s
distance traveled by the fish = speed x time = 9.5 x 0.55 = 5.225 m
The amount of heat needed is 338 J
Explanation:
When a substance is at its melting point, the amount of heat required in order to completely melt the substance is given by the equation:
where:
m is the mass of the substance
is the specific latent heat of fusion of the substance
In this problem, we have:
m = 5.24 g is the mass of gold
is the specific latent heat of gold
The sample of gold is already at its melting point, , therefore the amount of heat needed to melt it is:
Learn more about specific heat:
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Answer:
horse power of the truck 39,000 kgm²s⁻³
Explanation:
Calculate horse power of the truck.
Work = force x distance
where, force = mg = 2000 kg x 9.8 m/s² = 19,600 kgm/s²
distance = 10 meter
Work = 19,600 kgm/s² x 10 meter
= 196,000 kgm²s⁻²
Power = work / time
= 196,000 kgm²s⁻² / 5 seconds
= 39,000 kgm²s⁻³
Answer:
1) Skis have a large area to reduce the pressure on the snow. This ensures that the skis do not sink into the snow too far.
2) The pressure under the studs on the soles of football shoes is high enough for them to sink into the ground, which gives extra grip.
3) A vacuum cleaner has a fan inside that creates a low pressure inside the device. Consequently, air and dirt particles are sucked into the device.
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