In general, the more massive the star, the ________ its lifetime
Fill in the blank(s) with correct word
shorter.
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A tractor T is pulling two trailers, 
and 
with a constant acceleration. T has a mass of 200 kg, 
has a mass of 100 kg, and 
has a mass of 150 kg. If the forward acceleration is 0.60 
then the horizontal force on
due to the attachment to 
is
A. 270 N backward.
B. 270 N forward.
C. 150 N backward.
D. 150 N forward.
E. 90 N forward.
How do we know that pulsars must be very small in size (radius)?
A) We have measured their radii directly in high-resolution telescope images. B) Their small sizes are inferred from careful study of their spectra. C) Some spin so rapidly that if they were larger in size, their surfaces would be moving faster than the speed of light. D) Only very small objects can beam radiation into space. E) This is only a theory that has not yet been confirmed by observations.
In the open ocean, the tides are waves that have a period of 12 hours and a speed of 750 km/hr. What is their wavelength?
What will be an ideal response?
A current loop is oriented in three different positions relative to a uniform magnetic field. In position 1 the plane of the loop is perpendicular to the field lines. In positionS 2 and 3 the plane of the loop is parallel to the field as shown. The torque on the loop is maximum in
?
?
a.
position 1.
b.
position 2.
c.
position 3
d.
positions 2 and 3.
e.
all three positions.