Answer:
The car's average speed is 16 feet per second.
Explanation:
The expression for the average speed is as follows;
Given expression of distance:
Put t= 4 s.
d(4)= 36 ft
Put t= 7 s in the given expression.
d(7)= 84 ft
Calculate the car's average speed over the interval of time from t = 4 seconds to t = 7 seconds.
A.S= 16 feet per second
Therefore, the car's average speed is 16 feet per second.
From the given information, the only thing we can tell is the wave's speed ... 21 m/s .
That also happens to be the product of it's (frequency) x (wavelength), but we can't say what either one alone is.
None of the items listed can be calculated without more information.
Answer:
It's centripetal acceleration is 301.7 m/s²
Explanation:
The formula to be used here is that of the centripetal acceleration which is
ac = rω²
where ac is the centripetal acceleration = ?
ω is the angular velocity = 3 revolutions per second is to be converted to radian per second: 3 × 2π = 3 × 2 × 3.14 = 18.84 rad/s
r is the radius = 0.85 m
ac = 0.85 × 18.84²
ac = 301.7 m/s²
It's centripetal acceleration is 301.7 m/s²
Answer:
the angle of incident is 40°
Explanation:
NQ is the normal to the mirror, therefore
angle NQA =90°
PQA = 50°
incident angle = NQA - PQA
90°- 50° = 40°
note that the angle of reflection is equal to the angle of incident
Acceleration= change in velocity/time=27.8-0/4.8=5.792 ms⁻²
Force= Mass*acceleration=66*5.792=382.25 N