Answer:
1500J
Explanation:
Given parameters:
Mass of the block = 30kg
Height = 5m
Unknown:
Gravitational potential energy = ?
Solution:
The Gravitational potential energy of body is due to its position above the ground level.
Gravitational potential energy = mass x acceleration due to gravity x height
So;
Gravitational potential energy = 30 x 9.8 x 5 = 1470J or 1500J
Answer:
increases
Explanation:
when the mass of an object is constant and you add more force, acceleration increases
Answer:
The power radiated by the hawk is 0.452 Watt.
Explanation:
Given that,
Frequency = 50 Hz
Distance r=60 m
Level = 70 dB
We need to calculate the intensity
Using formula of intensity
Put the value into the formula
We need to calculate the power radiated by the hawk
Using formula of power
Put the value into the formula
Hence, The power radiated by the hawk is 0.452 Watt.
Answer:
The magnitude of the stone velocity before it hits the ground is 30 m/s.
Explanation:
Given;
initial vertical velocity,
final vertical velocity, = 30 m/s
Apply the following kinematic equation to determine the height of the cliff;
Determine time of the journey;
h = vₓ + ¹/₂gt²
vₓ = 0 (initial horizontal velocity when the stone was thrown vertically downward)
h = ¹/₂gt²
t = √ (2h / g)
t = √ (2(40.82) / 9.8)
t = 2.89 s
When the rock is projected horizontally, the horizontal distance, x = 40.82 m
Initial horizontal velocity,
The final vertical component of the velocity is given by;
The magnitude of the stone velocity before it hits the ground is given by;
Therefore, the magnitude of the stone velocity before it hits the ground is 30 m/s.