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A 100-kg boulder sits on the top of a 50-meter high cliff. It falls off. How fast is it traveling just before it hits the ground? A. 31 m/s B. 490 m/s C. 98 m/s D. 245 m/s
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A car is moving with a velocity of 20 meters/second has 1.8 x 10^5 joules of kinetic energy what is the mass of the car
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Cereal plants gain chemical potential energy as they grow. Which form of energy is converted to create the chemical potential energy? gravitational potential energy kinetic energy light energy thermal
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Which best compares a brush and a commutator in an electric motor? A- Both rotate when the motor is on. B- Both carry electrical current from a power source. C- Both remain stationary when the motor i
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The red supergiant Betelgeuse has a diameter of 1,680,000,000 km. If Betelgeuse is located 197 parsecs (pc) away, what is its apparent size (in arcseconds)?-- Note: The attached image shows multiple e
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The force of attraction or repulsion between two magnetic poles is similar to which of the following laws? Biot-Savart Force Law Coulomb’s Law Ohm’s Law Faraday’s Law
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Which best described how the current scientific model of the atom was developed? the model was the result of hundreds of years of experiments recent experiments invalidated most of the work of the las
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. Calculate the tensional force in a 5 m length of string that whirls a 2.5 kg mass at 15 m/s in a horizontal circle?
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If you are skateboarding and have to make a sharp turn to avoid a branch, in which direction are you accelerating?
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When a psychologist describes a developing culture as “primitive,” what bias are they displaying? A. sexism B. ethnocentrism C. racism D. xenocentrism
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A d.c. self-excited shunt generator has a field resistance of 160Ω. The generated emf is 420V and it supplies a load of 55kW Calculate the armature resistance when the generator terminal voltage is
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Calculate the slip of a 2 pole 3 phase induction motor when the supply frequency is 50 Hz and the rotor current frequency is 2 Hz.Full workings please and readable formatThanks
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A simple pendulum has wooden bob. If it is replaced by a copper Bob of same size,will there be any change in it's time period ? Explain
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A 16.03 piece of iron absorbs 1086.75 joules of heat energy and its temperature changes from 25 degrees C to 175 degrees C calculate specific heat of iron
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I question wasn't answer how long will a tongue piercings close I had mine about 7 years and been out about 5 years
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Kiley went 5.7 km/h north and then went 5.8 km/h west. From start to finish, she went 8.1 km/h northwest.Which best describes her numbers?5.7 km/h north and 5.8 km/h west are instantaneous speeds, whi
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How does the anatomy of the endocrine and integimentary systems correlate with the sense organs? what role does radiology and utilizing nuclear medicine play in this line of care?
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A force of 15 N is applied to a spring, causing it to stretch 0.3 m. What is the spring constant for this particular spring?
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The amount of fuel used to heat and cool your home can be reduced by good ____? A- Recycling B- conservation C- efficiency D- capacity E-fans F-misters G- insulation H-fission Please help me asap I'm
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Jim is rearranging his apartment and needs to move his entertainment center. If the gravity exerts 15 N and there is 10 N of friction, how much force will Jim need to exert to move it?
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A student pushes a book with a force of 5N to the east. which statement decribes the reaction force?
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The period of a sound wave coming from an instrument is 0.002 seconds. What is the frequency of the sound?
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David starts at a position of x=0 meters at the left side of the front of the classroom. Over the course of the class he walks back and forth in front of the class 15 times, 6 meters to the right, and
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It takes Delta U=402.3 J to raise the temperature of an amount of water by a certain temperature. How fast must a 0.42 kg ball trabel in order for it kinetic energy to equal this internal energy?
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A 10 gram sample of butter will melt at a temperature that is the melting point of 5 gram sample of butter
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If the worst fit line gradient is 9 and the best fit line gradient is 8, find the accepted gradient and uncertainty
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Which action do researchers take to make advances in science? They guard their findings against the scrutiny of outside sources. They share their experimental results with other researchers. They redu
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What is the cell cycle? A. repeating series of stages a dividing cell got through. B. the time a cell spends actively dividing. C. process of duplication of genetic material. D. repeating process of D
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A linear circuit is shown below. Figure 4-1 The elements in this circuit have the following values: R1=200Ω, R2=200Ω, R3=200Ω, V1=3V, I1=2A and I2=2A Determine the potentials at nodes A and B, assu
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Which of Shakina's statements regarding acceleration and velocity is false? "When the acceleration and velocity are in opposite directions, the particle slows down." "When the acceleration and velocit
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The block in the illustration is floating in water. Water has a density of 1.0 g/cm 3 and about 30 percent of the block is below water. What is a good estimate of the density of the block? A) 0.90g/cm
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In a thundercloud there may be an electric charge of 50 C near the top of the cloud and −50 C near the bottom of the cloud. If these charges are separated by about 3 km, what is the magnitude of the
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What animal dies in a desert area with the help of scavengers and bacteria it decomposes completely in the hot sun is second animal dies while drinking in a stream the body is covered in sediment befo
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Find the vertical displacement D(t) between the raised hands of the two players for the time period after Boris has jumped (t>tR) but before Arabella has landed.Find the vertical displacement D(t) bet
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What is an example of a hypothesis leading to a new experiment? Upon seeing bacteria under the microscope, scientists theorized that they could be the cause of illness. Galileo dropped different balls
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Select all that apply. Choose the statement(s) that best describe Earth's hydrologic, rock, and tectonic cycles. They continuously recycle Earth's materials. They contribute to a balance or equilibriu
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What is the magnitude of the gravitational force acting on a 4.0kg object which is 1.0m from 1.0kg object
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What is the magnitude of the gravitational know for checking a 4.0 kg object which is 1.0m from a 1.0 kg object
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Resultant of two equal forces may have the magnitude equal to 1 of the forces .At what angle the equal forces this is possible?Justify
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A car is traveling at 16m/s when the brakes are applied. The brakes decelerate the car at the rate of 5.0m/s^2. How long will it take to stop the car?
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A runner moves 2.38 a second North accelerates at .310 m/sssquared at a -62 degree angle how many seconds later is she running directly east
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In the 1887 experiment by Michelson and Morley, the length of each arm was 11m. The experimental limit for the ring shift was 0.005 fringes. If sodium light was used with the interferometer (λ = 589
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You drive a bumper car into another bumper car whose driver has a much larger body mass that you do. Who experiences more of a jolt, you or the other driver? Explain your answer.
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Is it possible for several scientists who have never met each other to contribute to the same scientific knowledge, theory, or law? Explain your answer.
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While researching life during colonial times, Carson learns that people would extract potassium hydroxide from wood ashes and mix it with animal fat. What were the colonists doing? generating hydrogen
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A pure solid such as naphthalene is heated until it all melts and the temperature of the liquid is then 90 degreesC. When the liquid cools, its temperature falls to about 800 C and then it remains con
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If you have a string of lights and one light goes out but others stay lit, which type of circuit do you have A) broken B) short C) series D) parallel
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What is electricity A) the movement of molecules B) the movement of atoms C) the movement of circuits D) the movement of electrons
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The city council is going to decide on whether or not to spray a certain insecticide for mosquito control. Many other towns already use this insecticide but your town wants to research the topic befor
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What kind of information doea the nutrition facts label give about requirements for essential nutrients
