current . . . flow of electric charges
voltage . . . stored potential energy at the source of a circuit
resistance . . . opposition to the flow of electric current
arrowRight . . . a button on the computer keyboard that causes the cursor to move to the right on the screen when pushed
arrowRight . . . a button on the computer keyboard that causes the cursor to move to the right on the screen when pushed
arrowRight . . . a button on the computer keyboard that causes the cursor to move to the right on the screen when pushed
Answer:
6.67 meters per second
Explanation:
Velocity is defined as the distance covered divided by the time it took to cover that distance. In your case the car traveled 200 meters in 30 seconds therefore its velocity is:
This periodic fraction can be rounded to 6.67 m/s
Now, if they ask you what is the answer in meters per minute, you can give an integer value for your answer simply by using the equivalent of 30 seconds to minutes in the velocity formula:
Answer:
She can swing 1.0 m high.
Explanation:
Hi there!
The mechanical energy of Jane (ME) can be calculated by adding her gravitational potential (PE) plus her kinetic energy (KE).
The kinetic energy is calculated as follows:
KE = 1/2 · m · v²
And the potential energy:
PE = m · g · h
Where:
m = mass of Jane.
v = velocity.
g = acceleration due to gravity (9.8 m/s²).
h = height.
Then:
ME = KE + PE
Initially, Jane is running on the surface on which we assume that the gravitational potential energy of Jane is zero (the height is zero). Then:
ME = KE + PE (PE = 0)
ME = KE
ME = 1/2 · m · (4.5 m/s)²
ME = m · 10.125 m²/s²
When Jane reaches the maximum height, its velocity is zero (all the kinetic energy was converted into potential energy). Then, the mechanical energy will be:
ME = KE + PE (KE = 0)
ME = PE
ME = m · 9.8 m/s² · h
Then, equallizing both expressions of ME and solving for h:
m · 10.125 m²/s² = m · 9.8 m/s² · h
10.125 m²/s² / 9.8 m/s² = h
h = 1.0 m
She can swing 1.0 m high (if we neglect dissipative forces such as air resistance).
Your answer would be both A and B, so c.