The type of galaxy that sometimes has a distinct bar of stars running across the central region is dwarf elliptical elliptical irregular spiral all of the above can have clear, distinct central bars

When an X-ray beam with a wavelength of 120 pm strikes the surface of a crystal with a lattice spacing of 165 nm, what is the maximum reflection angle with a value of n=1 32.6^circ 54.0^circ 21.3^circ 38.3^circ 18.4^circ

13) Consider a sample of iodinc -131 a. How many half-lives would it take for the sample to decay until less than 1% of the original isotope remained?

What is the change in energy of a hydrogen atom when it undergoes an electronic transition from n_(initial)=5 to n_(final)=2 2.09times 10^-18J 4.90times 10^-20J 4.57times 10^-19J 1.55times 10^-20J 1.55times 10^-19J

The larger the sample of a given substance the more dense it is. Otrue Ofalse

A mover is applying a force on a crate up an incline.The incline is slightly rough with a coefficient of kinetic friction of 0.150 If the piano is not accelerating, that is moving up the incline with constant speed, what is the magnitude of the work done by the mover if the incline is 3.00 m long and the piano has a mass of 180 kg. The angle of the incline is 10.0^circ Use three significant digits please. square disappointed

Which of the following basic forces at work in our universe is a fundamental force that acts between charged particles? a. Weak nuclear force b. Strong nuclear force c. Electromagnetic force d. Gravitational force

The same side of the moon always faces earth. True False

Identify the true statements about wavelengths of light. Select the TWO answers that are correct. Green light has more energy than any other wavelength of visible light. Red light has a longer wavelength and less energy than blue light. Plants reflect wavelengths of light that our eyes cannot detect. In the absence of visible light,photosynthesis proceeds with infrared wavelengths. Plants absorb wavelengths of light that our eyes perceive as green.

Which of the following scenarios best illustrates Newton's Second Law of motion? A ball rolling down a hill A book lying on a table A person walking at a constant speed A bird sitting on a branch

Hot Questions

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, $y=-\frac {1}{2}(g)t^{2}+v_{0}sin(\Theta )t+h$ $g=32ft/sec/sec$