Physics

A 87 kg weight-watcher wishes to climb amountain to work off the equivalent of a largepiece of chocolate cake rated at 948 (food)Calories. How high must the person climb? Theacceleration due to gravity is 9. 8 m/s2and 1food Calorie is 103calories. Answer in units of km
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Suppose that water waves coming into a dock have a velocity of 1.2 m/s and a wavelength of 2.4 m. with what frequency do these waves meet the dock
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Choose the correct statement describing, what will you see if you look at them with a telescope that has an angular resolution of 0. 5 arcsecond
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OBSERVATION: A shiny red rock is sitting at the bottom of a swimming pool. You grab a long stick and poke it into the pool aiming for the rock, but the stick overshot the rock by a lot. ANSWER GUIDE: Use concepts from L3 and L4 to explain two aspects of this observation: (1) Why was the rock in a different position than you thought it was? (2) Why does the rock appear red? What happened to the other colors in the white sunlight?
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A 100 kg stunt woman falls from a three-storybuilding that is 9. 9 m high. If she falls into a net,which slows her down over the course of 1 s,what force did she experience while landing?
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Two asteroids each have mass of 1. 41 x 10^14 kg. The strength of the gravitational force between them is 1,030 N. Calculate the distance between the asteroids
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A ball is dropped from a height of 10 meters onto a hard surface so that the collision at the surface may be assumed elastic. Under such conditions the motion of the ball is(A) simple harmonic with a period of about 1. 4 s (B) simple harmonic with a period of about 2. 8 s (C) simple harmonic with an amplitude of 5 m (D) periodic with a period of about 2. 8 s but not simple harmonic
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A radio wave transmits 2. 12 w/m2 average power per unit area. what is the peak value of the associated magnetic field? (0 = 4 107 tm/a and c = 3. 00 108 m/s)
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The various possible standing waves on a string are called theNodesAntinodesHarmonics (or resonant modes)incident waves
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The idea of "visible" and "invisible" work is related to other hierarchical dichotomies in our culture about work, including "valuable" and "unvalued" work
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If a bottle of oxygen with a pressure of 500 kPa with a volume of. 30 L at 290 K has a temperature change to 370 K and the volume changed to 1. 5 L because the bottle broke open and leaked into the bottles outer container, then what is the new Pressure of the oxygen? Remember the combined gas law equation. P1V1 / T1 = P2V2 / T2a. 128 kPab128 kPac0 kPad500 kPa Lp
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In a series circuit, how will the potential difference across a resistor and a lamp change if a switch is closed?
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Technician a says that there is often more than one circuit being protected by each fuse. Technician b says that more than one circuit often shares a single ground connector. Which technician is correct?a. Technician a. b. Technician b. c. Both technician a and b. d. Neither technician a and b
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During each individual collision you created did each of the two carts receive the same force during the collision?
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What is the acceleration of a 650 kg racing camel that has a Ford net force of 897N
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What is the acceleration of a 650 kg racing camel that has a forward net force of 897N
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The interior of a refrigerator has a surface area of 2. 6 m. It is insulated by a 4. 5 cm thick material that has a thermal conductivity of. 0119 J/ms C. The ratio of the heat extracted from the interior to the work done by the motor is 3. 8% of the theoretical maximum. The temperature of the room is 46. 5C, and the temperature inside the refrigerator is 8. 5C. Determine the power required to run the compressor. Answer in units of W
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What is the force of gravity between two 70.0kg masses that are separated by 2.50m?
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What are the effects of elastic limit on a structure built on a fault line?
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1.5 Find the center of gravity of a 100 mm x 150 mm x 30 mm T-section. H 150 mm -100 mm- G D BI 30 mm E -30 mm Figure 1.5 1.
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What force produces an extension of 2.5 cm?
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An airplane flies due north at 150km/hr with respect to the air. there is a wind blowing at 75 km/hr due east. what are the plane's speed with respect to the ground?
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A particle is confined to move on the surface of a circular cone with its axis on the vertical z axis, vertex at the origin (pointing down), and half-angle a. (a) Write down the Lagrangian L in terms of the spherical polar coordinates r and 0. (b) Find the two equations of motion. Interpret the 0 equation in terms of the angular momentum tz, and use it to eliminate 4 from the r equation in favor of the constant fz. Does your r equation make sense in the case that = 0? Find the value ro of r at which the particle can remain in a horizontal circular path. (c) Suppose that the particle is given a small radial kick, so that r(t) = ro E(t), where E(t) is small. Use the r equation to decide whether the circular path is stable. If so, with what frequency does r oscillate about r0?
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You are an astronomer and are making observations about avisible but faraway galaxy. In 2-3 sentences, describe what evidence you could gather to gain more information about (1) the galaxy's elementalcomposition and (2) its motion relative to the Milky Way Galaxy.
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