Answer:
Almost all machines require energy to offset the effects of gravity, friction, and air/wind resistance. Thus, no machine can continually operate at 100 percent efficiency.
Answer:
The answer is 40 N for APX
Explanation:
Nine
Basically you are using d = r * t
Frequency is 1 / t
d is more commonly represented by lambda (
). Lambda is the wavelength.
so the formula = c / f
More commonly it is written as *f = c.
Givens
c = 3*10^8 m/s
= 0.1 nm = 0.1 nm *[1 m /1 * 10^9 nm] = 0.1 * 10^ - 9 meters.
f = ??
f = 
f = 3 * 10^8 * 10^9 / 0.1 = 3 * 10^18
Answer: C
Ten
= c/f
= 3*10^8 / 1 * 10^16
= 3*10^-8 meters
= 30 * 10^-9 meters = 30 nm
Answer: D
105 km/h ≈ 29.2 m/s
60.0 km/h ≈ 16.7 m/s
Before the collision the test car has an acceleration <em>a</em> of
<em>a</em> = (29.2 m/s - 0) / (8.43 s) ≈ 3.46 m/s²
During the collision, the car is slowed to about 16.7 m/s, so that its (average) acceleration is
<em>a</em> = (16.7 m/s - 29.2 m/s) / (0.635 s) ≈ -19.7 m/s²
i.e. with magnitude about 19.7 m/s².
Overall, the car has an average acceleration of
<em>a</em> = (16.7 m/s - 0) / (8.43 s + 0.635 s) ≈ 1.84 m/s²
