Yes. If you are riding a bike up a hill in fifth gear, you will burn considerably more calories than if you were to bike up that hill in first gear. The lower the gear, the easier the pedaling, and therefore fewer calories are burned.
Answer: R=24.2Ω
Explanation: <u>Power</u> is rate of work being done in an electric circuit. It relates to voltage, current and resistance through the following formulas:
P=V.i
P=R.i²
The resistance of the system is:
R = 24.2Ω
<u>For the device, resistance is 24.2Ω.</u>
Answer:
The arrow is at a height of 500 feet at time t = 2.35 seconds.
Explanation:
It is given that,
An arrow is shot vertically upward at a rate of 250 ft/s, v₀ = 250 ft/s
The projectile formula is given by :
We need to find the time(s), in seconds, the arrow is at a height of 500 ft. So,
On solving the above quadratic equation, we get the value of t as, t = 2.35 seconds
So, the arrow is at a height of 500 feet at time t = 2.35 seconds. Hence, this is the required solution.
Answer:
The answer to your question is T2 = 580.5 °K
Explanation:
Data
Temperature 1 = T1 = 273°K
Pressure 1 = P1 = 388 kPa
Pressure 2 = P2 = 825 kPa
Temperature 2 = ?
Process
1.- Use the Gay-Lussac law
P1/T1 = P2/T2
-Solve for T2
T2 = P2T1/P1
-Substitution
T2 = (825)(273) / 388
-Simplification
T2 = 225225 / 388
-Result
T2 = 580.5 °K
Answer:
the total energy before collision is 12.25J
the total energy after collision is tranfered to sound and heat (by the friction between the two clay balls)
Explanation:
first we should know the velocity of the 2 balls:
momentum=mass ×velocity
we have the momentum and the mass of the 2
so momentum ÷mass=velocity
clay ball 1 velocity=7 m/s & clay ball 2 velocity= -7 m/s
KE=1/2 mv²
1/2 ×0.25×7²=6.125J KE of ball 1
1/2 ×0.25×-7²=6.125J KE of ball 2
add them both we will have 12.25J which is before collision
this energy will then be tranfered to heat and sound as they stop after the collision(velocity =0m/s)
