Physics

projectile a is launched horizontally at a speed of 20 meters per second from the top of a cliff and strikes a level surface below, 3 seconds later. projectile b is launched horizontally from the same location at a speed of 30 meters per second. approximately how high is the cliff?
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Explain the characteristics of galaxies and galaxyclusters.
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Newtons second law of motion on a flying chair swing ride
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of negligible mass, spring constant k and unstretched length L. First, one spring is attached to the end of the other spring and slowly lowered to its equilibrium position. The two spring stretch a total distance of X1. Next the spring are hung side by side. The block is attached to the end of the springs and again slowly lowered to its equilibrium position. The springs each stretch a distance of X2. Which of the following correctly shows the relationship between x1 and x2?(a) X1=X2(b)X1=2X2(c)X1=2X2(d)X1=4X2(e)X1=8X2
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CONVERT A COAL PRICE OF $90/TON TO $/MMBTU, ASSUMING A HEAT CONTENT OF 7,000 BTU PER POUND A: $3.00/MMBtu B: $34.50/MMBtu C; $2.80/MMBtu D: $6.42/MMBtu E: $3.46/MMBtu
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compared to the speed of the heavier block, what is the speed of the light block after both blocks move the same distance d ?
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you have a choice to drill your water well into a shallow, unconfined aquifer or a deep, confined aquifer. drilling deeper will cost more money; however, you chose to drill into the confined aquifer. why?
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IIf the Sun were twice as massive its pull on the Earth would double. the pull of the Earth on the Sun would double. Its pull on the Earth would double; and the pull of the Earth on lhe Sun would double. none of the other choices arc correct.
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A 45 kg mass is dragged 50 m over a surface. If 1.0 kW of power is produced over 10 seconds,what is the coefficient of friction for the surface?
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a potato falling vertically downward is struck by a dart that is traveling vertically upward, as shown above. the dart and potato then collide, stick together, and continue moving after the collision. question consider the dart-potato system. which of the following graphs best represents the speed v of the center-of-mass of the dart-potato system, as a function of time t, before, during, and after the collision?
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7. What was one advantage of the Stanford-Binet scale intelligence tests over previous ones?The Stanford-Binet scale tests were more accurate.The Stanford-Binet scale tests were given with paper and pencil versus conducting one-on-one interviewsThe Stanford-Binet scale tests accounted for differences in social class.The Stanford-Binet scale tests accounted for differences in test takers from different social classes.
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What is a maximum load weight?
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What is the formula of MGBR?
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a conducting rod is free to slide along a pair of conducting rails, in a region where a uniform and constant (in time) magnetic field is directed into the plane of the paper, as the drawing illustrates. initially the rod is at rest. there is no friction between the rails and the rod. what to the rod after the switch is closed? if any induced emf develops, be sure to account for its effect. ignore air resistance.
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suppose that a huge tank 50m high and filled with water is open to the atmosphere and is hit with a bullet that pierces one side of the tank, allowing water to flow out. the hole is 5m above the ground. if the hole is very small in comparison with the size of the tank, how quickly will the water flow out of the tank?
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What is the inverse relationship between size of the wavelength frequency and energy?
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Which of the following describes a natural satellite?an object that senses radiation from celestial objectsan object that observes another planetan object that orbits another planetan object that records images of celestial objects
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what energy technologies depend on solar radiation as the originating source? select all that apply.
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Let's Examine the Three Laws of MotionDirections: Read each example below and identify which law of motion it isfollowing.1. If you blow up a balloon, and then release it. the balloon will fly away.2. When two balls collide, two balls on the opposite end will also move.3. Two teams are playing tug-a-war and team A wins because of unbalanced forces.4. A skateboarder will remain in motion while going down a hill until it is stopped by an outsideforce.__5. In a catapult, it is easier to launch a stone weighing 60 kg than it is to launch a stone weighing600 kg..6. A dog asleep will remain sleeping until it is woken up..
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an unsuccesstul life-historv strategv would be associated with bopulations that: decrease in size over time increase in size over time either decrease or do not change in size over time either increase or do not change in size over time.T/F
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What does an inclined plane increase and decrease?
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At which position is the northern hemisphere experiencing spring? point a
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a 20 kilogram ball rolls down a ramp and accelerates at a rate of 12 m/s per second. what is the net force acting on the ball?
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What is the frequency of A photon that has A wavelength of 300 nm?
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