Which best describes a radioactive isotope? (A) An atom is unstable. (B)An atom is stable. (C)There is only one other isotope. (D)There are many isotopes
In the formula vy = ayt, what is the value of ay for an object in projectile motion? A –9.8 m/s2 B 0 m/s2 C m/s2 D 1.0 m/s2
Most tornadoes carry wind speeds that range from A. 267 to 322 km per hour. B. 1 to 105 km per hour. C. 178 to 266 km per hour. D. 105 to 177 km per hour.
Ho Chi Minh led the Communist forces in Indochina and in North Vietnam. a. True b. False Hitler and Mussolini headed two of the Axis powers of World War II. a. True b. False
The allowed energies of a quantum system are 1.0 ev, 2.0 ev, 4.0 ev, and 7.0 ev. what wavelengths appear in the system's emission spectrum
Which characteristic is given by the principal quantum number? a)orbital size b)orbital mass c)orbital shape d)orbital orientation
The cloud of interstellar dust and gas that forms a star is known as a A. protostar. B. white dwarf. C. red giant. D. nebula. User: 15. With an average surface temperature of about 737 K, _______ is the hottest planet. A. Mars B. Mercury C. Earth D. Venus
How much work is required to move an electron through a potential difference of 3.00 volts? (1) 5.33 × 10^–20 J (3) 3.00 J (2) 4.80 × 10^–19 J (4) 1.88 × 10^19 J
If the absolute temperature of a gas is 600 K, the temperature in degrees Celsius is a. 873°C. b. 705°C. c. 327°C. d. 273°C.
In general, metalloids are slightly reactive. Please select the best answer from the choices provided T F
Which of the following is a poor conductor of heat?. A. silver. B. aluminum. C. gold. D. copper. E. air. How can you tell the difference if its a poor conductore or not?o.o
Which statement is true regarding the "relationship merry-go-round"? A. Most people chose to remain single in order to pursue career goals. B. By the age of 40, about 75% of Americans have married at least once. C. In some cultures, romantic love was considered a form of madness. D. Arranged marriages are no longer the norm in India.
At a constant pressure, freezing occurs by A)absorbing energy B)releasing energy C)conducting energy D)circulating energy.
Which is not a way to conserve existing energy resources? a) explore nuclear fusion b) improve solar technology c) use available fossil fuels d) increase energy efficiency
Which change increases the electric force between objects? -Two neutral objects are moved closer together. -Electrons are added to two negatively charged objects. -Two oppositely charged objects are moved farther apart. -The charge on two positively charged objects is reduced.
What is the current widely accepted theory about global climate change and what are some predictions associated with it?
During adverse weather conditions such as rain or fog, drivers should take action accordingly by turning on their headlights, slowing down and increasing
At approximately what frequency do most people perceive the least intense sounds? enter your answer numerically in hertz to two significant figures.
What does the zigzag line in the circuit diagram represent? A. a source of electrical energy B. an electrical conductor C. an electrical resistor D. an open switch
When viewed from Earth, Mars appears to change colors. This most likely happens because A. gases in the dense Martian atmosphere are constantly changing. B. volcanic activity produces thick gas clouds. C. dust storms lasting for weeks cause the atmosphere to change color. D. active volcanoes on the Mars surface intermittently flood the surface with lava.
What instrument did navigators use to calculate the positions of the sun and the stars? a caravel a carrack an astrolabe a compass