Physics Homework Answers & Questions Page 47

• How can I calculate the net force of an object?

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• How are parallel circuits used in homes?

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• How does gas exert pressure on its container?

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• How is friction force related to normal force?

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• How do you convert meters to centimeters or millimeters?

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• A block of wood floats in a liquid of density 0.8g/cm sq. with one fourth of its volume submerged. In oil the block floats with 60% of its volume submerged. Find the density of (a) wood? (b) oil?

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• Why is a ladder an inclined plane?

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• What is the SI for a unit of power?

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• How is energy conserved in an endothermic reaction?

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• Why was Edison electric power plant important?

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• 1 m is equivalent to 3.281ft. A cube with an edge of 1.5ft has volume of?

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• In order to open the clam it catches, a seagull will drop the clam repeatedly onto a hard surface from high in the air until the shell cracks. If a seagull flies to a height of 27 m, how long will the clam take to fall?

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• What is the source of mechanical energy in an electric generator?

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• What is projectile motion?

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• What is a transformer?

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• What is the comercial unit of enrgy and si unit energy establish the relationship between comercial unit and si unit of energy ?

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• What is the definition of elastic potential energy?

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• How do you calculate the fundamental frequency of a pipe?

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• What does LASER stand for?

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• Why must the universe be an isolated system to obey the Law of Conservation of Mass?

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• Why do scientists use the joule as the unit of measurement of energy instead of the calorie?

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• A Proton and an Alpha particle are accelerated by same potential difference.If they enter in a region of uniform electric field in a direction perpendicular to it, then deflection of which is more?

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• Why the Newton's second law of motion important?

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• At time t = 0 s, a wheel has an angular displacement of zero radians and an angular velocity of +28 rad/s. The wheel has a constant acceleration of -0.50 rad/##s^2##. In this situation, at what time will the wheel come to a halt?

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• Why only gold leaves are used in electroscope?

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• The latent heat of vaporization of water is 2260 J/g. How many grams of water at 100°C can be converted to steam by 226,000 J of energy?

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• Write the applications of high specific heat capacity of water in daily life?

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• Why is the mass for elements on the periodic table written as a decimal?

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• Why is projectile motion parabolic?

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• How can electromagnetic waves be used to measure distance?

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• How do vectors subtract graphically?

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• Using Huygen's principle, explain why diffraction of light can be regarded as a special case of interference ?

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• What is mechanical advantage and mechanical efficiency??

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• When a ball is thrown upwards, what is the relationship between kinetic and potential energy at the initial position and maximum height reached by the ball?

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• What is the difference between reflection and refraction?

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• How do you convert 8 mi/h to ft/min?

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• The diameter of a steel rod is given 56 +- 0.2 mm. What does it mean?

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• In the figure, one end of a uniform beam of weight 420 N is hinged to a wall; the other end is supported by a wire that makes angles θ = 29° with both wall and beam. ?

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• What is a strong nuclear force and what is a weak nuclear force?

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• 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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