Answer:
(a) The velocity of the car before the brakes were applied is 77.46 ft/s
(b) The time required for the car to stop is 7.8 s
Explanation:
Given;
acceleration of the car, a = 10 ft/s²
distance traveled by the car, d = 300 ft
(a) the velocity of the car before the brakes were applied is given;
v² = u² + 2ad
v² = 0 + 2(10 x 300)
v² = 6000
v = √6000
v = 77.46 ft/s
(b) the time required for the car to stop
d = ut + ¹/₂at²
d = 0 + ¹/₂at²
d = ¹/₂at²
t² = 2d / a
t = √ ( 2d / a)
t = √ ( 2 x 300 / 10)
t = 7.8 s
Therefore, the time required for the car to stop is 7.8 s
The reading on the scale is equal to the weight of the student which is 646.8 N.
The given parameters;
- <em>mass of the student, m = 66 kg</em>
The reading on the scale is determined by applying Newton's second law of motion as follows;
<em>The student is at rest and not accelerating, a =0</em>
Thus, the reading on the scale is equal to the weight of the student which is 646.8 N.
The complete question is below:
A 66 kg student stands on a very light, rigid board that rests on a bathroom scale at each end as shown in (Figure 1). what is the reading on the scale?
Learn more about Newton's second law here: brainly.com/question/3999427
Answer:
Wave Speed (m/s)
31.25
Summary
Wavelength (m)6.25
Frequency (hz)5
Explanation:
https://calculator.academy/wave-speed-calculator/#f1p1
Answer:
The frequency of radio waves with a wavelength of 20m is
1.5 e+7 Hertz (Hz) or 15 million Hertz.
This was obtained from the formula speed (c) is equal to the product of frequency (f) and wavelength (λ)
c = fλ
Since we are looking for the frequency, we will divide both sides of the formula above by the lamda symbol for wavelength, which gives us:
f = c / λ
The value of wavelength is already given which is 20 meters. The speed of radio waves is the same with the speed of light when travelling in a vacuum – also with the other electromagnetic waves. Hence the speed (c) is 3 e+8 m/s
f = 3 e+8 m/s / 20m
f = 1.5 e+7 H
Explanation:
this is the correct answer you want.
Hadrosaurs were better runners than earlier thought. The fossilized hadrosaur is well preserved that scientists discovered that its muscle mass is larger and learned that it was even more muscular than what was thought before. Its hindquarters are 25 percent larger than previously thought, meaning they can run up to 28 mph or faster, probably to outrun predators like the T-rex who has a 10 mph running speed.
They discovered it to be 3 and a half tons in weight and about 40 feet or 12 meters long. The fossil was found in 1999 in North Dakota by a teenager name Lyson, and is now being studied in the world's largest CT scanner operated by Boeing Co. The fossilized dinosaur's name is Dakota.