# Science Bowl (Physics Part 6) Science Bowl
PHYSICS
PHYS-91; Multiple Choice: Which of the following sets of 3 forces CANNOT have a vector sum of zero? w) 10, 10 and 10 Newtons x) 10, 10 and 20 Newtons y) 10, 20 and 20 Newtons z) 10, 20 and 40 Newtons
ANSWER: Z -- 10, 20 AND 40 NEWTONS
PHYS-91; Multiple Choice: A small cluster of stars appear, after many decades of observation, to be converging toward a common point in the sky. Does the light from these stars show a: w) red Doppler shift x) blue Doppler shift y) no Doppler shift
ANSWER: W -- RED DOPPLER SHIFT
PHYS-91; Short Answer: What name is given to those elementary particles for which there is a symmetry under intrapair production. Included are photons, pi mesons, and nuclei with an even number of particles.
PHYS-91; Multiple Choice: When a fast charged particle traverses a dielectric medium at a velocity exceeding the velocity of light in that medium, radiation is emitted. This radiation is known as: w) point radiation x) Cerenkov radiation y) Synchrotron radiation z) Bremsstrahlung
Physics - 36 Science Bowl
PHYSICS
PHYS-91; Multiple Choice: Which of the following statements dealing with simple harmonic motion of a mass-spring system is TRUE? w) The acceleration is largest when the oscillating mass is instantaneously at rest. x) The larger the spring force constant the larger the period. y) The period of the motion depends linearly on the amplitude of the motion. z) The acceleration is larger when the oscillating mass has its greatest velocity.
ANSWER: W -- THE ACCELERATION IS LARGEST WHEN THE OSCILLATING
MASS IS INSTANTANEOUSLY AT REST
PHYS-91; Multiple Choice: An ice skater is rotating with her arms extended. When she pulls in her arms her rate of rotation increases. Which of the following statements dealing with the process is TRUE? w) Her moment of inertia is increased. x) Kinetic energy is conserved. y) The skater does work when pulling in her arms. z) Angular momentum is increased.
ANSWER: Y -- THE SKATER DOES WORK WHEN PULLING IN HER ARMS
PHYS-91; Multiple Choice: If viewed on an oscilloscope, the loudness of a sound wave would be associated with the wave's: w) frequency x) wavelength y) velocity z) amplitude
PHYS-91; Multiple Choice: If a sled has a constant acceleration of 2 meters per second squared and starts from rest, the distance in meters that it will have covered after 5 seconds is: w) 10 meters x) 20 meters y) 25 meters z) 50 meters
Physics - 37 Science Bowl
PHYSICS
PHYS-91; Multiple Choice: The neutrons in an atom: w) are part of the nuclear charge x) rotate about the nucleus in elliptical orbits y) vary in number with different isotopes z) are always equal in number to the total number of protons
ANSWER: Y -- VARY IN NUMBER WITH DIFFERENT ISOTOPES
PHYS-91; Multiple Choice: Which of the following phenomena suggest that light may be a transverse wave? w) reflection x) polarization y) photoelectric effect z) diffraction
PHYS-91; Multiple Choice: In simple harmonic motion, the acceleration is: w) constant x) proportional to the distance from the central position y) greatest when the velocity is greatest z) none of the above
ANSWER: X -- PROPORTIONAL TO THE DISTANCE FROM THE CENTRAL
POSITION
PHYS-91; Multiple Choice: When a liquid moves through a pipe having a varying diameter, the pressure against the inside walls of the pipe will be: w) the same throughout x) lowest where the diameter is smallest y) lowest where the diameter is largest z) lowest where the velocity of flow is lowest
ANSWER: X -- LOWEST WHERE THE DIAMETER IS SMALLEST
Physics - 38 Science Bowl
PHYSICS
PHYS-91; Multiple Choice: The gravitational potential energy of an object close to the ground varies: w) inversely as its distance from the ground x) directly as its distance from the ground y) inversely as the square of its distance from the ground z) directly as the square of its distance from the ground
ANSWER: X -- DIRECTLY AS ITS DISTANCE FROM THE GROUND
PHYS-91; Multiple Choice: When the image formed by a convex mirror is compared to its object, the image is usually: w) erect and smaller x) inverted and imaginary y) real and inverted z) real and erect
ANSWER: W -- ERECT AND SMALLER
PHYS-91; Short Answer: In optics, when the vibrations of light are limited to a single two dimensional plane, it is said that light has been what?
PHYS-91; Multiple Choice: One nanometer is equal to: w) 10-12 meters x) 10-11 meters y) 10-3 meters z) 10-9 meters
PHYS-91; Multiple Choice: In radioactive decay, the emission of an electron is characteristic of: w) Alpha decay x) Beta decay y) Gamma decay z) X-rays
Physics - 39 Science Bowl
PHYSICS
PHYS-91; Multiple Choice: Energy is described as the capacity for: w) reactivity x) combustion y) transformation z) doing work
PHYS-91; Multiple Choice: Kinetic energy is energy of: w) position x) radiation y) motion z) formation
PHYS-91; Multiple Choice: The kinetic energy of a stone falling near the earth's surface through a vacuum increases with the: w) square root of its velocity x) cube root of its velocity y) square of its velocity z) cube of its velocity
ANSWER: Y -- SQUARE OF ITS VELOCITY
PHYS-91; Short Answer: What is the mass of a 60 kilogram astronaut in space, far from any planets?
PHYS-91; Short Answer: What is the weight of a 150 pound astronaut in space, far from any planets?
PHYS-91; Short Answer: In what type of reference frame does Newton's law NOT hold true?
Physics - 40 Science Bowl
PHYSICS
PHYS-91; Multiple Choice: Which of the following does NOT travel in a vacuum? w) radio waves x) gamma rays y) magnetic waves z) sound waves
PHYS-91; Short Answer: What is the amplitude of a standing wave at its node?
PHYS-91; Multiple Choice: An incident ray comes in parallel to the principle axis of a concave mirror. Is it reflected: w) back along the incident ray x) at 30 degrees to incident ray y) through the focal point z) through the center of curvature
ANSWER: Y -- THROUGH THE FOCAL POINT
PHYS-91; Short Answer: For small oscillations, what happens to the period of a simple pendulum when the mass of the pendulum bob is doubled?
ANSWER: NOTHING or PERIOD IS UNAFFECTED
PHYS-91; Short Answer: Why must soldiers break cadence when crossing a bridge?
ANSWER: SO THEY DON'T EXCITE A VIBRATIONAL RESONANCE IN THE BRIDGE.
PHYS-91; Short Answer: Who named the two kinds of electrical charges "positive" and "negative"?
PHYS-91; Short Answer: What SI prefix is used to represent 10-18?
Physics - 41 Science Bowl
PHYSICS
PHYS-91; Short Answer: When a slingshot exerts a 10 Newton force on a rock, the rock accelerates at 50 meters per second squared. What force is required to accelerate the rock to 150 meters per second squared?
PHYS-91; Short Answer: How are work and power related?
ANSWER: POWER IS THE AMOUNT OF WORK PER UNIT TIME
PHYS-91; Short Answer: Heat transfer by mixing is more commonly known as what?
PHYS-91; Short Answer: Sound waves are an example of what type of wave?