What type of composition does an igneous rock have that contains mostly plagioclase feldspar and about 30 percent dark silicate minerals?
Identify the following physical quantities as scalars or vectors. -position -velocity -displacement -speed -acceleration -average velocity -distance
_______ are atoms that carry an electric charge. A. Colloids B. Electrolytes C. Nonelectrolytes D. Ions
Which of the following statements about surface waves is true? The strength and duration of the wind controls size and frequency. The longer the wind blows in the same direction, the weaker the waves become. Friction between the wind and surface water decreases the size of the wave. Surface waves are caused by rushing water underneath the surface
Sb-34 when operating a boat near other boats or when entering a congested area, why should you watch your wake?
Which of the following statements about the tundra is not true? a. The tundra has limited vegetation. b. There are two main categories of the tundra biome. c. Temperatures in the tundra can get below -20° F. d. The tundra biome does not support animal life. Please select the best answer from the choices provided A B C D
Which of the following statements about covalent bonds is false? a. The resulting compound is a poor conductor of electricity. b. The resulting compound can be dissolved in water. c. The resulting compound has a dull appearance. d. The bond can be formed only between nonmetals.
A car is traveling around a horizontal circular track with radius r = 220 m as shown. It takes the car t = 61 s to go around the track once. The angle θA = 23° above the x axis, and the angle θB = 57° below the x axis. 1) What is the magnitude of the car’s acceleration? 2) What is the x component of the car’s velocity when it is at point A 3) What is the y component of the car’s velocity when it is at point A 4) What is the x component of the car’s acceleration when it is at point B 5) What is the y component of the car’s acceleration when it is at point B
In a series circuit one of the resistors is replaced with a resistor having a lower resistance value. How does this affect the current in the circuit?
The pressure, P, of a gas varies directly with its temperature, T, and inversely with its volume, V, according to the equation formula to find pressure, where n is the number of molar units and R is the universal gas constant. One molar unit of a gas has a pressure of about 1,245 joules at a temperature of 300 Kelvin and a volume of 2 liters. What is the pressure of the same number of molar units of the gas at a temperature of 400 Kelvin and a volume of 2.5 liters? a)1,328 joules b)1,900 joules c)2,375 joules d)2,600 joules
What do electric forces between charges depend on? a. the quantity of charge involved b. how far apart the charges are. c. both a. and b. d. none of the above
Which of the following leads to the conclusion that momentum is conserved?. A) proportionality between weight and mass. B)equal magnitude and opposite direction of action-reaction pairs of forces. . C) equivalence principle. .D) relation between translation and rotation of an object that is rolling.
Sb-28 a collision could occur when the distance decreases and bearing between two vessels does what?
Which of the following is not true about covalent compounds? A.they are made of molecules and can be gases, liquids or solids B.they have low melting and boiling points C.they are good electrical conductors in in all phases D.many are soluble in nonpolar Liquids but not in water
The radius of the earth's very nearly circular orbit around the sunis 1.5\times10^11 m. Find the magnitude of the earth's velocity as it travels around thesun. Assume a year of 365 days. Express your answer using two significant figures. wherev=km/s Find the magnitude of the earth's angular velocity as it travelsaround the sun. Assume a year of 365 days. Express your answer using two significant figures. wherew=s^-1 Find the magnitude of the earth's centripetal acceleration as ittravels around the sun. Assume a year of 365 days. Express your answer using two significant figures. wherea=m/s^2
As Chelsea removes her clothes from the dryer, she sees sparks, which are examples of ________________. A.) Conduction B.) Induction C.) Static discharge D.) Static Electricity
4. The shape (not the size) of an electron cloud is determined by the electron's ____. energy sublevel position speed principal quantum number
A box of mass m is sliding along a horizontal surface. part a the box leaves position x=0 with speed v0. the box is slowed by a constant frictional force until it comes to rest at position x=x1. find ff, the magnitude of the average frictional force that acts on the box.
Which is a tool used by scientists to determine the composition of objects? a hologram a spectrometer a wave front a prism
Solar cells convert what type of energy into electrical energy? A. thermal B. electromagnetic C. chemical D. nuclear
When an earthquake occurs, S waves are the first seismic waves to arrive at a given location. Please select the best answer from the choices provided T F
What type of rays are used to locate cavities in teeth? Radio waves, infrared rays, ultraviolet rays, microwaves, x-rays, or gamma rays
. Question: 23 of 24:. Which statement is true regarding DC current?. Select one of the options below as your answer:. . A.. The electrons move back and forth.. B.. There can only be one voltage supplied.. C.. A high voltage current can be transformed into a low voltage current.. D.. A low voltage current can be transformed into a high voltage current.. E.. This is what is sent from the power plants to your home..
Which statement best describes why a machine is useful? A-A machine does a greater amount of work than the amount of work that is done on it. B-A machine does a smaller amount of work than the amount of work that is done on it. C-A machine can decrease both the input force and the input distance needed to do a given amount of work. D-A machine can decrease either the input force or the input distance needed to do a given amount of work.