A school bus moves past a parked car at a speed of 30 km/hr. Which of the following BEST describes the observation made by a pas
1 answer:
Answer:
C.The car appears to be moving 30 km/hr in the opposite direction of the bus.
Explanation:
There are two reference systems involved in this situation:
- Reference system S: this is the reference system where velocities are measured with respect to the ground. In this reference system, the car is parked, so its velocity is
- Reference system S': this is the reference system moving with the bus. This reference system is moving with a velocity of with respect to the reference system S
Calling the velocity of the car in the reference system S', we have:
From which
and the negative sign means that a passanger in the bus observes the car moving in the opposite direction.
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Answer:
A. Parallel to the ground, approximately toward the golfer's shoulders
Explanation:
Elliptical path represent the motion of the golf club.
From the figure we have the motion of the club. So the acceleration provided will be centripetal acceleration so halfway through the swing the direction of acceleration will be towards the golfer's shoulder.
