A radiation detector measures radioactivity decay of a piece of radium by catching and counting alpha particles it emits. Making this measurement affects the
A) radiation rate of the piece of radium.
B) alpha particles that are caught and counted.
C) both of these
D) neither of these
Answer: B
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The first modern astronomer to propose a heliocentric model for the solar system was ____________________
Fill in the blank(s) with correct word
In a contest, two tractors pull two identical blocks of stone the same distance over identical surfaces. However, block A is moving twice as fast as block B when it crosses the finish line. Which statement is correct?
A. Block A has twice as much kinetic energy as block B. B. Block B has lost twice as much kinetic energy to friction as block A. C. Block B has lost twice as much kinetic energy as block A. D. Both blocks have had equal losses of energy to friction. E. No energy is lost to friction because the ground has no displacement.
A 10-kg block on a rough horizontal surface is attached to a light spring (force constant = 1.4 kN/m). The block is pulled 8.0 cm to the right from its equilibrium position and released from rest. The frictional force between the block and surface has a magnitude of 30 N. What is the kinetic energy of the block as it passes through its equilibrium position?
a. 4.5 J b. 2.1 J c. 6.9 J d. 6.6 J e. 4.9 J
Think of a closed rectangular loop of wire around the edge of a horizontal page. A magnetic field perpendicular to the page points upward and increases in strength in a certain time. During this time the conventional current induced in the loop will be
A. clockwise. B. continually changing direction. C. zero. D. counterclockwise.