A sealed glass jar contains carbon dioxide gas. As the temperature of the gas in the jar increases, what will most likely happen? a. its pressure will increase b. its volume will decrease c. its mass will increase d. its weight will decrease
A skier has an acceleration of 2.5 m/s2. How long does it take her to come to a complete stop from a speed of 18 m/s? A. 3.4 s B. 7.2 s C. 15.5 s D. 0.14 s
Which sequence correctly shows how stars form? a nebula forms → nebula collapses → protostar forms → fusion begins b protostar forms → nebula forms → fusion begins → nebula collapses c fusion begins → nebula forms → protostar forms → nebula collapses d nebula forms → protostar forms → nebula collapses → fusion begins
Polarized sunglasses work by A. blocking light waves that vibrate in one plane. B. gradually refracting light as it passes through the lenses. C. bending light as it passes from air into the lenses. D. reflecting most of the light that strikes the sunglasses.
In a cold pack, an ___________ reaction draws heat from the surroundings. A. exothermic B. endothermic C. exergonic
Why will marchers at the end of a long parade following a band be out of step with marchers nearer the band
Stated the types of material a scrap heap magnet can and cannot move. HELP ME PLEASEEEE!!!! I NEED THE ANSWER IMMEDIATELY!!!!!
Which of the following statements is true about light? A. Light needs a medium through which to travel B. Light can not be diffracted around objects C. Light can travel through the vacuum of space D. Light moves slower than sound
please help How much heat does it take to raise the temperature of 9.0 kg of wood from 12C to 97C? The specific heat of wood is 1.68 kJ/(kgC). Use Q = mc(Tf - Ti). A. 760 kJ B. 1300 kJ C. 180 kJ D. 1500 kJ
Refraction: a. causes light to "bounce off a surface b. causes blueshift c. is caused by light moving through different substances d. is caused by the source of the waves moving closer to the receiver e. is caused by light moving around a corner
Which band in visible light has the shortest wavelength? a. yellow b. red c. green d. violet e. blue or f. orange
What direction does current flow from a battery in a series circuit? A. From negative to positive terminals B. From positive to negative terminals C. In alternating directions D. In more than 1 direction
Which type of wave is UNABLE to travel through the vacuum of space? A. circumstantial B. evidentiary C. electromagnetic D. mechanical
49 tamela12 Please help What is the efficiency of a device that takes in 40,000 J of heat and does 12,000 J of work while giving off 28,000 J of heat? Use and convert to a percentage. A. 57% B. 43% C. 30% D. 70%
