Speed= f x λ ( f= frequency. λ = wavelength)
Speed = 2Hz x 6m
= 12m/s
Mechanical Advantage= output force/input force. So, 156/52=3. You're MA is 3.
Answer:
G. it enables people to use pots and pans made of metal to cook food
Explanation:
Metals are known to be substances with a relative high melting point, which means that it takes a very high temperature to melt them. As used in this question, copper (Cu) and iron (Fe) at metallic elements that have high melting points.
One advantage of this property based on the options provided is that "it enables people to use pots and pans made of metal to cook food". This is because cooking food requires subjecting them to a constant temperature from a heat source e.g cooker or stove.
The material used to hold the food being cooked must possess a very high melting point to withstand the heat, hence, the importance of these metallic substances. Most pots and pans are made of steel, an alloy of iron, hence, they have high melting point.
Answer:
Total energy will be
Which is not in the given option
Explanation:
We have given mass m = 1 kg
Height h = 200 km = 200000 m
Speed
Acceleration due to gravity
We have to find the energy
Total energy will be sum of kinetic energy and potential energy
So
Which is not in the given option
Answer:
The height is "89.61 m". A further explanation is given below.
Explanation:
According to the question,
Mass of rocket,
m = 5 kg
Time,
t = 4.6 s
Initial speed of rod
u = o m/s
Final speed,
v = 39 m/s
drag,
= 60 N
So,
⇒ acceleration,
⇒
Now,
The thrust will be:
⇒
⇒
⇒
⇒
⇒
⇒
The height will be:
⇒