An ? particle is also known as
A) an electron.
B) a positron.
C) a helium nucleus.
D) a high-energy photon.
C
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Which of the following measurements of other solar systems would require us to change our current solar system formation theory?
A) The age of another solar system is significantly older than our solar system. B) The planets in other solar systems mostly orbit their central stars in the same plane and same direction as the other planets in that solar system. C) Some stars have no planets. D) Some stars have many planets. E) Many other stars have planets orbiting in many different directions and at many different angles.
A 0.20-kg block rests on a frictionless, level surface and is attached to a horizontally aligned spring with a spring constant of 80 N/m. The block is initially displaced 4.0 cm from the equilibrium point and then released to set up a simple harmonic motion. A frictional force of 0.3 N exists between the block and surface. What is the speed of the block when it passes through the equilibrium
point after being released from the 4.0-cm displacement point? a. 0.45 m/s c. 0.72 m/s b. 0.63 m/s d. 1.2 m/s
The law of conservation of momentum applies to a collision between two bodies since
A. they exert equal and opposite forces on each other. B. they exert forces on each other respectively proportional to their masses. C. they exert forces on each other respectively proportional to their velocities. D. they exert forces on each other respectively inversely proportional to their masses. E. their accelerations are proportional to their masses.
When a hydrocarbon or carbon-hydrogen-oxygen compound is burned completely, the products are
a. CO2 and H2O. b. CH2 and O2. c. CO and H2. d. C and H2.