Explain what is meant by a net or unbalanced force
What will be an ideal response?
An unbalanced, or nonzero, net force always produces an acceleration. In some instances, an applied unbalanced force may also deform an object, that is, change its size and /or shape. A deformation involves a change in motion for some part of an object; hence, there is an acceleration.
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A supercluster refers to a large group of stars within the Milky Way
Indicate whether the statement is true or false
When the sum of the external forces and the sum of the external torques on a body are both zero, we can conclude that
a. the body is moving at constant velocity but is not rotating. b. the body is rotating at constant angular velocity but has no linear velocity. c. the body has neither linear nor angular velocity. d. the body may have constant linear or angular velocity, but not both simultaneously. e. the body may have constant linear or constant angular velocity, or both simultaneously.
A rock, released at rest from the top of a tower, hits the ground after 2.0 s. What is the speed of the rock as it hits the ground? (g = 9.8 m/s2 and air resistance is negligible)
a. 15 m/s c. 31 m/s b. 20 m/s d. 39 m/s
The radiation curve is a plot of light intensity versus frequency for an incandescent source. If this light is first passed through a cool gas, the resulting radiation curve would most probable look like
1) I. 2) II. 3) III. This best illustrates that the atoms of gas have 4) been excited. 5) absorbed part of the light. 6) simplified selective frequencies of the transmitted light.