9 Suppose an astronomer observes a star system oriented towards her as shown in the animation. The system itself has no motion along the line of sight from Earth. The light of the inner star as it orbits the center of mass is redshifted. does not change. is blueshifted. What method might be used to detect the existence of the outer planet in this system? direct detection diffraction method transit method radial velocity method

Which of the following laboratory tools would be most appropriate for determining the volume of an irregular shape? graduated cylinder triple beam balance and graduated cylinder ruler triple beam balance

7) The color white is a mixture of what colors of light? Red and Green Indigo and violet Blue and yellow Blue and orange All of the colors

6) What color comes between blue and violet on the visible spectrum of light? Red Orange Green Indigo Violet

5) What color comes between yellow and blue on the visible spectrum of light? Red Orange Green Indigo Violet

1) The __ of a light wave is how fast it goes up and down. Wavelength Period Amplitude Frequency Velocity

Practice Problem #2 Water has density of 1000kg/m^3 .What is the weight of water displaced by a beach ball with a radius of 1.1 m if 85% of the ball is submerged?

Which statement is true about the half-life of a radioactive isotope? Choose 1 answer: A There is no known method of changing a radioisotope's half-life. B The half-lives of radioisotopes are typically around 10,000 years. C Half-life can be used to predict when a single nucleus in a radioisotope sample will decay.

3. As you move an object further from the center of a magnet, which of the following happens? The magnetic field strengthens The magnetic field flips The magnetic field weakens

1. What subatomic particles affect the mass of an atom? a. Protons b. Neutrons c. Electrons d. Protons and Neutrons e. Neutrons and Electrons

Hot Questions

At what temperature does the average speed of an oxygen molecule equal that of an airplane moving at 583 mph? Express your answer using one decimal place. $T=\square ^{\circ }C$

97 Multiple Choice 1 point 50 pounds of pressure will lift a column of water how high. 511.5 ft 115.5 ft 111.5 ft 2.31 ft

What term describes an x-ray beam composed of numerous energy levels? Anisotropic Isotropic Monoenergetic Polyenergetic

True or false: Right ascension is measured in hours and minutes because the Earth rotates and 1 day is divided up into 24 hours. Select one: True False

True or False: Magnitude zero stars have zero brightness. Select one: True False

What is the minimum number of ice cubes at $0.0^{\circ }C$ needed to cool 240 mL of coffee at $75^{\circ }C$ to $0.0^{\circ }C$ ? Assume each ice cube is 18.0 g of water and the density of the coffee is $1.0g/mL$ $\Delta H_{fus}=334J/g$ $C_{H_{2}O,I}=4.18J/g\cdot ^{\circ }C$ Number of ice $cubes=[?]$ Hint:The energy from the coffee cooling melts the ice cubes. Round to the nearest whole ice cube.

What is the total kinetic energy before the collision? What is the total kinetic energy after the collision?3 Which of the following is true? i. Kinetic energy and momentum are both conserved. ii. Only momentum is conserved but energy is lost.

c. A2kg object moving East at a velocity of 21 meters per second strikes a 20 kilogram object that was at rest. After the collision the 2 kg object moves east with a velocity $1m/s$ and the 20 kg object moves east with a velocity of $2m/s$ What is the total momentum of the system before $collision.^{2}$ What is the total momentum of the system after the collision.

Which of the following ranks the three states of matter from most to least ordered? $solid\gt liquid\gt gas$ $solid\gt gas\gt liquid$ $gas\gt liquid\gt solid$ $gas\gt solid\gt liquid$

A crate of medicine with a density of 138 pounds per cubic foot will be shipped from the U.S. to Israel. What is the crate's density in kilograms per cubic meter? First fill in the two blanks on the left side of the equation using two of the ratios. Then write your answer rounded to the nearest hundredth on the right side of the equation. Ratios: $\frac {35.3ft^{3}}{1m^{3}}$ $\frac {1m^{3}}{35.3ft^{3}}$ $\frac {2.2lb}{1kg}$ $\frac {1kg}{2.2lb}$ $\frac {138lb}{1ft^{3}}\times \square \times \square =\square \frac {kg}{m^{3}}$