In one experiment showing that faster-moving objects have larger masses,
A) high-velocity rifle bullets are fired at targets and their impact is measured.
B) high-speed microscopic particles pass through electromagnetic fields, and the bending of their path is measured.
C) a microscopic balance-beam is used to measure the speeds of particles emitted during radioactive decay.
D) observers move along beside high-velocity rifle bullets, in order to measure the masses of the bullets.
E) microscopic particles are released from rest in a gravitational field, and their acceleration is measured.
B
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Molecules in a region of expanding air more often collide with neighboring molecules that are
A) approaching. B) receding. C) nearly out of range.
The ozone layer lies in the mesosphere
Indicate whether the statement is true or false
A coil lies flat on a horizontal tabletop in a region where the magnetic field points straight down. The magnetic field disappears suddenly
When viewed from above, what is the direction of the induced current in this coil as the field disappears? A) counterclockwise B) clockwise C) clockwise initially, then counterclockwise before stopping D) There is no induced current in this coil.
A 4.0-kg mass has a velocity of 4.0 m/s, east when it explodes into two 2.0-kg masses. After the explosion one of the masses has a velocity of 3.0 m/s at an angle of 60° north of east. What is the magnitude of the velocity of the other mass after the explosion?
a. 7.9 m/s b. 8.9 m/s c. 7.0 m/s d. 6.1 m/s e. 6.7 m/s