Question

o1
the international space station (iss)
orbit the earth at about 27,678 kilometres
(17,100 miles) every hour this is an
example of
a. orbital speed
b. velocity
c. acceleration
d. none of the above
o2
what is the speed of an eagle that travels
200 meters in 4 seconds?
a. 800 m/s²
b. 800 m/s
c. 50 m/s²
d. 50 m/s
o3
what is the average speed of someone
who walks 3 kilometers in 1 hour?
a. 3 m/h
b. 0.33 km/h
c. 3 km/h
d. 0.33 km/h²
o4
a meteor changed speed from 1.8 km/s
to 1 km/s in 0.03 seconds. what was
the acceleration of the meteor?
a. 26.7 km/s²
b. -26.7 km/s²
c. -33.3 km/s²
d. 60 km/s²

Explanation:

Q1

Orbital speed is the speed needed to maintain a stable orbit around a celestial body. The ISS orbiting Earth at a given speed is a classic example of orbital speed. Velocity requires direction (not just magnitude as given here). Acceleration is a change in velocity. Since it's about orbiting speed, it's orbital speed.

Step1: Recall speed formula

Speed \(v=\frac{d}{t}\), where \(d = 200\) meters and \(t=4\) seconds.

Step2: Calculate speed

\(v=\frac{200}{4}=50\) m/s. Units of speed are m/s (not m/s² which is for acceleration).

Step1: Use speed formula

Speed \(v = \frac{d}{t}\), with \(d = 3\) km and \(t = 1\) hour.

Step2: Compute speed

\(v=\frac{3}{1}=3\) km/h.

Answer:

A. Orbital speed

Q2