Physics Homework Answers & Questions Page 48

• How do you calculate the magnitude of displacement?

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• How human body temperature is maintained at normal value (37 degrees centigrade) when the atmospheric temperature rises as high as 45 degrees centigrade ?

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• Why is the index of refraction always greater than or equal to 1?

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• The radius of curvature of a spherical mirror is 30 cm. What is the focal length of the mirror?

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• A dart is thrown horizontally with an initial speed of 10m/s toward point P,the bull's eye on a dart board.It hits at point Q on the rim,vertically below P,0.19s later. What is the distance PQ? How far away from the dart board is the dart released?

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• How does the law of conservation of matter and energy relate to the cycles in nature?

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• A disk revolves in a horizontal plane at a steady speed of 3rev/s. A coin will remain on the disk if it is kept a distance of 2cm from the axis of rotation. What is the coefficient of friction between the coin and the disk?

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• Is a mirror's surface transparent, translucent, or opaque? How do you know?

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• What is the difference between electric potential and electrostatic potential energy?

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• Does uniform circular motion have constant acceleration?

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• What is an example of kinetic energy in nature?

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• How do you calculate the moment of inertia of a beam?

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• What are some examples of speed of sound?

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• How does Newton's second law relate to inertia?

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• What are standing waves?

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• How does frictional force of the pulley affect the acceleration of the system?

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• How much does a 78.0 kg student weigh on earth (g = 9.81##m/s^2##) and on the moon (g = 1.60##m/s^2##)?

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• What is pseudo force?

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• The speed of sound in air is about 340 m/s. What is the wavelength of a sound wave with a frequency of 220 Hz?

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• How do I know when the Fnet in y direction is 0, any hint i have a test tomorrow?

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• What does a horizontal line mean in a speed-time graph?

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• What are conservative and non-conservative forces?

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• What does acceleration mean in motions graphs?

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• An arrow is shot at a 30 degree angle with a velocity of 39m/s. How high will it go? What horizontal distance will it travel?

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• The Eiffel Tower in Paris stands 300.0 m tall on a day of average temperature, 22.0°C. How much taller is the steel tower on a hot summer day (T = 40°C) in centimeters? (αsteel = 11 x 10-6 °C-1)

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• The resultant of two forces one double the other in magnitude is perpendicular to the smaller of the two forces. the angle b/w the two forces is? a. 120 b/ 60 c/ 90

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• A book weighs ##6.0## ##N##. If the acceleration of gravity is ##9.8## ##m####/####s^2##, what is the mass of the book in kilograms?

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• What are some examples of conduction?

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• How does the coulomb law differ from newton's law of universal gravitation?

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• How do you calculate kinetic energy in simple harmonic motion-pendulums?

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• How many 325 mg ibuprofen tablets can be produced from 2.50 kg of ibuprofen?

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• In raising a 5000N piano with a pulley system, the movers note that for every 2m of rope pulled down, the piano rises 0.2m. What is the effort force required to lift the piano?

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• A beaker containing water is placed on a spring scale and reading is W. Now a stone of weight D is hung by means of massless string and lowered in water without touching the bottom of beaker. What is the new reading on spring?

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• How to write an equation relating distance to force? With a table and graph?

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• If the index of refraction of water is 1.33, what is the speed of light in water?

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• How do nuclear reactions change the identity of an atom?

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• What is a STANDING WAVE? How is an echo formed?

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• What two simple machines make a screw?

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• A 1000-watt microwave oven takes 60 seconds to heat a bowl of soup. How many joules of energy does it use?

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• Why is latent heat called hidden energy?

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• How does Newton's third law work when you walk?

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• Because gravity on is about one-third of that on Earth, could you infer that Mars has more mass than Earth?

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• What is 20 degrees celsius in fahrenheit?

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• How does kinetic molecular theory explain the Charles' law?

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• Why is acceleration measured in meters / seconds squared?

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• What is the relationship between the second law of thermodynamics and entropy?

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• How does heat energy affect the movement of water molecules?

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• What is the principle of superposition of waves?

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• How can Newton's first law be derived from Newton's second law?

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• How to find the moment of inertia of a solid cylinder about transverse (perpendicular) axis passing through its center?

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