Answer:
1879.33J
874.1W
Explanation:
Given parameters:
Distance covered = 2.91m
Time taken = 2.15s
Mass of Bart = 65.9kg
Unknown:
Work done = ?
Power rating = ?
Solution:
Here, the work done is related to the the potential energy in climbing this flight of stairs.
Work done = Potential energy = mgH
where m is the mass
g is the acceleration due to gravity
H is the height
Work done = 65.9 x 9.8 x 2.91 = 1879.33J
Power is defined as the rate at which work is being done.
Power = 
= 
= 874.1W
Answer: The weight of a girl with a mass of 40kg is 392.266 Newtons.
Explanation:
<span>The answer is Music Mnemonics.
Mnemonic is originally coming from the Ancient Greek word means “memory”. It is the study and development of systems for improving and assisting the memory. Mnemonic techniques are more specific memory aids. Music Mnemonic is a way we used to remember song lyrics and rhythmic movement.</span>
Answer:
1.2825 * 10^3 kg/m³
Explanation:
Given that :
Mass of aluminum ball (m1) = 4kg
Apparent mass of ball (m2) = 2.10 kg
Density of aluminum (d1) = 2.7 * 10^3 kg/m³
Density of liquid (d2) =?
Using the relation :
d1 / d2 = m1 / (m2 - m1)
(2.7 * 10^3) / d2 = 4 / (4 - 2.10)
2700 / d2 = 4 / 1.9
4 * d2 = 2700 * 1.9
4 * d2 = 5130
d2 = 5130 / 4
d2 = 1282.5 kg/m³
Hence, density of liquid = 1.2825 * 10^3
Sound waves move through molecules. When there are no molecules in a certain space, sound cannot travel - whether in a vacuum or in space.
