Answer: D. 40
Explanation:
Power = Force * Velocity
Force = 600N
Power needs to be converted to Watts:
= 24 * 1,000
= 24,000 W
24,000 = 600 * Velocity
Velocity = 24,000/600
= 40 m/s
The density of the object is approximately 1.91 kg per m³.
42 kg is a measure of mass, and 22 m³ is a measure of volume. Knowing this, you can use the relationship
to solve for the object's density.
42 kg
22 m³
1.91 kg per m³.
Answer:
12.5 m/s
Explanation:
If the avg speed is 10 m/s we assume that the speed is constant and not fluctuating
If VT (Velocity*Time) is equal to speed at the end of the 4 seconds of accel. it is the top speed at the finish line
since the speed is 0 at the beginning of races, we will use V0= 0 m/s
So the avg velocity for those 4 seconds is (VT+V0) /2 = or 1/2 VT (for 40% of the race)
The avg velocity for the last 6 seconds is, of course, VT (for 60% of the race
hence
(1/2VT)(.4) + VT(.6) = 10 m/s
VT = 10/.8 = <u>12.5 m/s
</u>
<h2>
<u>Given</u>:</h2>
Horizontal distance between two boats = x = 14 m
One boat is at trough, the other is at crest.
As there is no crests between them meaning the boat are next to each other.
Wavelength is the distance between two consecutive crests/troughs = w
The distance between a crest and a trough next to it = w/2
Complete cycles = c = 5
Time taken for c cycles = t = 15 s
Vertical distance between two boats = y = 2.4 m
<h2>
<u>To find</u>:</h2>
wavelength = w = 2x = 28 m
Amplitude = A = Displacement from mean to extreme position = y/2 = 1.2 m
Time period for one cycle = T = t/c = 15/5 = 3 s/cycle
frequency = 1/T = 1/3 = 0.33 hertz
speed = wavelength/Period = w/T = 28/3 = 9.33 m/s