Answer:
2.75x10⁻¹⁰m
Explanation:
By scientific notation, we have to express 0.000000000275 m in powers.
This can be done by counting the number of zeros after the decimal and the number after 0 which is 2.
from 2 to the decimal point, we have 10 characters
so we express it scientifically as,
= 2.75x10⁻¹⁰m
for easy understanding. i have added an attachment to help you out on how to do this.
The energy used is B) 43,200 J
Explanation:
The power used by the blender is related to the energy in input by the equation
where
P is the power
is the energy in input to the blender
t is the time interval
Since we know that
P = 300 W
t = 180 s
We can find that
However, we are said that the blender has an efficiency of 80%: this means that only 80% of the input energy is actually used to make the smoothie. Therefore, the energy used is
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Answer:
The kinetic energy will be 49000[J]
Explanation:
This problem is the common use of energy conservation when the body is at the top at the point where its elevation is the highest (usually the lowest point is taken as the reference level) at that point the body will have the highest potential energy, then as the body descends its potential energy decreases but its kinetic energy begins to increase. By the time the body reaches the lowest point or reference point, its potential energy will be zero, but its maximum kinetic energy, as all potential energy has become kinetic energy.
Therefore:
This energy will be transformed into kinetic energy at the bottom of the hill.
F = m.a
a = v^2 / r
a = 12^2 / 6.0
a = 24 m/s^2
F = 55 × 24
F = 1320 N