Suppose that a car traveling to the East (+x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its acceleration
A)
The car is decelerating, and its acceleration is positive.
B)
The car is decelerating, and its acceleration is negative.
C)
The acceleration is zero.
D)
The car is accelerating, and its acceleration is positive.
E)
The car is accelerating, and its acceleration is negative.
B
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A rifle is fired straight downward from a high-altitude balloon. If the bullet leaves the barrel at 100 m/s, then its speed one second later (neglecting air resistance) will be about
1) 10 m/s 2) 100 m/s 3) 105 m/s 4) 110 m/s and its distance below will be about 5) 5 m. 6) 100 m. 7) 105 m. 8) 110 m. 9) 120 m.
Which element makes up the largest percentage
by mass in the human body? a) oxygen b) carbon c) nitrogen d) iron
If you wish to spear a small blue fish with a red laser beam, you should compensate for refraction and aim your laser
A) directly at the sighted fish. B) above the sighted fish. C) below the sighted fish.
Relative Velocity: An airplane is pointed at 45° north of east and is moving at 71 m/s with respect to the air. The jet stream (moving air) carries the plane at 30 m/s toward the east. What are the magnitude and direction of the velocity of the plane relative to the ground?
What will be an ideal response?