A fighter plane moving 200 m/s fires a projectile with speed 50 m/s in a forward direction. The projectile makes an angle of 30 with the direction of the plane's motion.
What is the speed of the projectile with respect to a stationary observer on the ground? A) 293 m/s
B) 243 m/s
C) 268 m/s
D) 250 m/s
E) 281 m/s
Question 2
An unknown resistor is wired in series and an ammeter and a voltmeter are placed in parallel across both the resistor and the ammeter. This network is then placed across a battery.
If one computes the value of the resistance by dividing the voltmeter reading by the ammeter reading, the value obtained A) is the true resistance.
B) is greater than the true resistance.
C) is less than the true resistance.
D) could be anything. It depends on other factors.
Scaling the Earth down to the size of a basketball, the Moon is roughly the size of a tennis ball. T
Doppler Effect, Observer Moving
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