A European sports car dealer claims that his car will accelerate at a constant rate from rest to 100 km/h in 8.00 s. If so, what is the acceleration? (Hint: First convert speed to m/s.)
a. 3.47 m/s2
b. 6.94 m/s2
c. 5.21 m/s2
d. 10.4 m/s2
e. 8.68 m/s2
a
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Rotational Kinetic Energy: A solid uniform 3.33-kg disk has thin string of negligible mass wrapped around its rim, with one end of the string tied to the ceiling, as shown in the figure. The disk is released from rest, and as it falls, it turns as the string unwraps. At the instant its center has fallen 2.25 m, (a) how fast is the center moving, and (b) how much rotational kinetic energy does the disk have?
What will be an ideal response?
The sun has a radius of
km and a rotational period of 25.38 days. What is the difference is there in the peak of the observed spectrum between light received from the approaching side of the Sun and from the receding side of the sun? Observations from the middle of the sun place the spectral peak at 480 nm.
A. 13 nm B. 6.4 nm C. 1.6 nm D. 3.2 nm
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?
The polarization of light passing though the dust grains shows that:
A) the dust grains are elongated in shape. B) the dust grains are aligned by a weak interstellar magnetic field. C) the dust grains are chiefly made of iron. D) Both A and B are correct. E) All of the above are correct.