Answer:
The rate of change in the velocity of an object per unit time is referred as acceleration and the kind of motion is known as accelerated motion. The acceleration is positive when it is in the direction of velocity and negative when it is opposite to the direction of velocity.
Explanation:
Answer:
f = 686N
Explanation:
parameters given ;
mass = 70kg
force = ?
acceleration due to gravity = 9.8m/s²
from the formula for finding force ,
force is equals to mass of an object multiplied by its acceleration due to gravity
i.e
f = ma
f = 70 × 9.8
f = 686N
Therefore the force that she uses to push she pushes on the ground before she stands up is 686NEWTON.
Answer:
Its new current will be 240.0milliAmps
Explanation:
According to ohms law,
V = IR
V is the supply voltage in a circuit
I is the current
R is the resistance
If the current in the wires of a circuit is 120.0 milliAmps, the voltage will be:
V1 = 120R1
R1 = V1/120...(1)
If the voltage impressed across the ends of the circuit were doubled (with no change in its resistance),
V2 = 2V1
V2 = IR2
2V1 = IR2
R2 = 2V1/I ... (2)
Since there are no changes in resistance
R1 = R2
Equating 1 and 2, we have:
V1/120 = 2V1/I
1/120 = 2/I
Cross multiplying
I = 2×120
I = 240milliAmps
The Earth takes (365 and 1/4) days to orbit the sun. That's the length of our 'year'.
Since it's not really possible to make our calendar a quarter of a day longer every year, we make the calendar a <u><em>whole</em></u> day longer every 4 years.
So "Leap years" make up for the extra one-fourth day the Earth takes to orbit the sun.
The total mechanical energy of the skydiver is 178,000 J.
The given parameters;
- <em>Kinetic Energy of the skydiver, K.E = 100,000 Joule</em>
- <em>Gravitational Potential Energy of the skydiver, P.E = 78,000 Joules.</em>
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The total mechanical energy of the skydiver is the sum of the kinetic energy and the potential energy.
<em>Total mechanical energy = K.E + P.E</em>
Total mechanical energy = 100,000 J + 78,000 J
Total mechanical energy = 178,000 J
Thus, the total mechanical energy of the skydiver is 178,000 J.
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