Physics

henrietta leavitt found a relationship using the cepheid variables (in a star cluster) to help us determine distances. what was the correlation she found between the luminosity of a variable star and the period?
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What is the distance between two wave front?
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What do you find most difficult about developing a research topic? What strategies are you most likely to use now that you have information about how to develop a quality topic?
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A dynamo in a watch transfers 0.05 W of power every second to make a hand turn. Calculate the energy this transfers to the hand.
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which produces the greater change in kinetic energy (assume that all of the work goes into kinetic energy)? group of answer choices . exerting a 10 n horizontal force through a distance of 5 m exerting a horizontal force of 40 n through a distance of 1m exerting a horizontal force of 20 n through a distance of 2 m exerting a 30 n horizontal force through a distance of 1.5 m
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sinusoidal water waves are generated in a large ripple tank. the waves travel at 20cm/s and their adjacent crests are 5cm apart. the time required for each new whole cycle to be generated is?a) 100 s b) 4.0 s c) 2.0 s d) 0.5 s e) 0.25 s
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A 95kg solid sphere with a radius of 15cm is suspended by a vertical wire attached to the ceiling of a room. A torque of 0.20Nm is required to twist the sphere through an angle of 0.85rad. What is the period of oscillation when the sphere is released from this position?
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What is the force required to keep the object sliding on a surface with the same speed?
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A narrow beam of light is travelling through a transparent liquid. It meets the surface as shown, atan angle of incidence of 40. The refractive index of the liquid is 1.5.airliquid40What is the angle of refraction as the light enters the air?A 25B 27C 60D 75
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Why is CO2 so important to the food industry?
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what building stands at 1,776 feet tall in a nod to the declaration of independence?
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Give an example for each of the following energy conversion: (1) electrical energy to kinetic energy. (2) chemical energy to electrical energy
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A car travels with tangential speed V1 around curve of radius and turns to the left; as shown by the rear view of the car in Figure A force diagram of the forces exerted on the car with speed of 5 m/s as it turns is shown in Figure 2. force diagram of the forces exerted on the car with speed as it turns around the same curve of the same radius with the same tangential speed is shown in Figure 3. The speed of the car is most nearly
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What are examples of genetic risk factors?
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Executive agreements differ from formal treaties in that they 1) have been ruled unconstitutional by the U.S. Supreme Court. 2) must be approved by the U.S. Supreme Court but not by Congress. 3) do not have to be approved by the Senate 4) do not have to be approved by the House. generally formulated at 5) meetings of the United Nations. are Question 12 (1 point) The President can influence the legislative process through 1) communicating with the American public 2) leading his/her political party. 3) reporting on the State of the Union. 4) all of the above.
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Due to the nature of this problem, do not use rounded intermediate values in your calculationsFind the currents flowing in the circuit in the figure below. (Assume the resistances are R1 = 20 ,R2 = 6 ,R3 = 15 ,R4 = 10 ,r1 = 0.5 ,r2 = 0.25 ,r3 = 0.25 , and r4 = 0.5 .)I1 = AI2 = AI3 = A
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How do you find the missing angles when a transversal cuts through parallel lines?
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the sound intensity levels for a machine shop and a quiet library are 85 db and 40 db, respectively. what is the difference between the intensity of the sound in the machine shop and that in the library?
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what must you do to keep it in focus? what must you do to keep it in focus? increase the f -stop value. move the lens away from the sensor or film. decrease the f -stop value. move the lens closer to the sensor or film. none of the above.
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a circular loop of wire with a radius of 15.0 cm and oriented in the horizontal xy-plane is located in a region of uniform magnetic field. a field of 1.2 t is directed along the positive z-direction, which is upward.
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What evidence supports the theory of ocean floor?
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What it means gains momentum ?
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which set of changes will always increase the current in an electrical circuit?
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the sun burns ______ to make _____A. hydrogen, heliumB. helium, hydrogenC. propane, butaneD. butane, propane
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