What is the SI unit in the measurement of radioactivity? Multiple Choice Ci mCi uCi Bq rutherford
When we see a crescent moon the rest of the face that we see is not completely dark because __ A) it is partially facing toward the Sun B) it is slightly illuminated by sunlight reflected by Earth C) it is slightly illuminated by the light of Earth's cities D) it is slightly illuminated by starlight
18. A Hot Wheels car rolls off a table at a speed of 3.57m/s and hits the floor a distance of 0.91 meters from the table's edge. Determine the height of the table.
According to Newton's First Law.what happens to an object that is at rest and has no outside forces acting upon it? The object will begin to lose mass. The object will create its own moving force. The object will stay at rest. The object will gain acceleration over time.
A 14.5 kg barrel is pulled with a 22.1 N force at a 48.7^circ angle,, across the ground where the coefficient of friction (mu _(k)) is equal to 0.200. What is the normal force acting upon the barrel? n=[?]N
Multiple Choice 1 point The amount of energy required to raise the temperature of 1 kilogram of water by 1^circ Celsius is a calorie joule measure of density kilocalorie None of the answer choices are correct
2. the distance between stars 10^6 10^8 10^15 centimeter petameter meter
Which of the following is true about resistors? They are typically not replaced. They can't be used in parallel circuits. They are frequently replaced. They can't be used in series circuits.
30. A12 -kg projectile is launched with an initial vertical speed of 20m/s It rises to a maximum height of 18 m above the launch point. What is the change in mechanical energy caused by the dissipative (air) resistive force on the projectile during this ascent?
Ultraviolet light waves carry more energy than infrared light waves. True False
Saturn is made up of which gases? a Hydrogen b Helium Both A and B d None of the above
A quantum of radiatior has an energy of 2.0 keV. What is its frequency? $(h=6.63x$ $10^{-34}J\cdot s$ and $1eV=1.60\times 10^{-19}J)$ 1) $3.2\times 10^{17}Hz$ 2) $4.8\times 10^{17}Hz$ 3) $6.3\times 10^{17}Hz$ 4) $7.3\times 10^{17}Hz$ 5) $8.5\times 10^{17}Hz$
Inside a freely-falling elevator you would have no weight. gravitational force on you. both of these none of the above
Which of the following does not involve a change of state? A sublimation of dry ice B freezing water C pouring water into a vacuum-insulated bottle D melting ice
Shown below is the decay equation for ${}^{14}C$ Given this equation, what type of decay does an unstable ${}^{14}C$ nucleus undergo? ${}_{6}^{14}C\rightarrow _{5}^{14}N+_{-1}^{0}e$ a) Gamma Decay b) Beta Decay c) Positron Emission d) Alpha Decay e) Electron Capture f) This question is written incorrectly. Choose this for full points and I also assigned an additional try.
Ultraviolet light or sunlight has no effect on nylon slings. True False
Inside a freely-falling elevator your acceleration is zero. weight is zero. gravitational I interaction with Earth is zero. all the above none of the above
How many joules are needed to change the temperature of 1 g of water by $1^{\circ }C$ Express your answer with the appropriate units.
64. Food probe thermometers that display both Fahrenheit and Celsius scales must have an accuracy of $\pm 0.9^{\circ }F(\pm 0.5^{\circ }C)$ $\pm 1.8^{\circ }F(\pm 1^{\circ }C)$ $\pm 2.7^{\circ }F(\pm 1.5^{\circ }C)$ $\pm 3.6^{\circ }F(\pm 2^{\circ }C)$
A golf ball is struck across a flat fairway at an angle of $60^{\circ }$ with an initial speed of $135ft/s$ a.). Write a set of parametric equations for the motion of the golf ball. b.). Determine how long the golf ball was in the air. c.). Determine how far the golf ball traveled in the air. Show all work. Use the Equation Editor. $x=v_{0}cos(\Theta )t$ Recall, $y=-\frac {1}{2}(g)t^{2}+v_{0}sin(\Theta )t+h$ $g=32ft/sec/sec$
