Physics Homework Answers & Questions Page 49

• What is the difference between Thrust and Force?

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• What is difference between (1) Anion & Anode (2) Cation & Cathode?

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• Air is cooled from room temperature 25 C to 100 K what is the temperature change in K?

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• A certain length of wire when vibrated with another sonometer wire produced 2 beats per second for both the lengths ##122 cm## and ##120 cm## of this second sonometer wire and it's tension is same in both the occasions. What is the frequency of first wire?

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• What is the difference between an internal and an external circuit?

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• How will you prove the formula ##cos(A-B)=cosAcosB+sinAsinB## using formula of vector product of two vectors?

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• How do kepler's laws of planetary motion relate to newton's law of universal gravitation?

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• How do beats help determine whether two sound waves are of the same frequency?

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• A sphere with a radius of 1.7cm has a surface area of? a) ##3.6*10^-3 m^2## b) 36 m c) 3.66mm

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• Is an antinode caused by constructive or destructive interference?

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• What type of wave is a sound wave?

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• A 4 g air-rifle pellets is fired into a target block attached to a glider. The block and glider total mass is 0.5 kg. The target slides along the track a distance 1.455 m. The track is inclined 10 degree. Determine pellet velocity from air rifle?

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• How does length of a string affect its frequency? Thanks

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• Is a parallel circuit better than a series circuit?

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• Why is diffraction grating more accurate than double slits to measure the wavelength of light?

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• What are some examples of net forces?

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• What is the SI unit of electric field?

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• An astronaut has a mass of 100 kg and has a weight of 370 N on Mars. What is the gravitational strength on Mars?

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• What is the difference between speed and velocity and acceleration?

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• What is an example of an energy transformation from electrical to sound energy?

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• How do you draw a converging lens ray diagram?

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• How is the conservation of momentum related to Newton's third law?

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• What are the criteria for a total internal reflection to occur?

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• The resistence of a conductor 5 ohm-what does it means?

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• What is the mathematical expression of Newton's law of gravitation?

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• Why do falling objects reach a terminal velocity?

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• What is an advantage of using an electromagnet rather than a regular magnet?

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• How is the acceleration of a moving object determined?

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• What is the difference between gravitational force and weight?

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• How do sound waves transfer energy?

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• A satellite is placed in equatorial orbit above Mars, which has a radius of 3397km and a mass M=6.4x10^23 kg. The mission of the satellite is to observe the Martian climate from an altitude of 488km. What is the orbital period of the satellite?

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• How do you express 12 km/L in miles/gal?

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• What does velocity mean in motions graphs?

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• Name two advantages of relative density over density in measurement?

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• If an object has a mass of 50 kg, what is its weight?

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• Suppose you connect a battery to a small light bulb with a single wire. What will happen?

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• Sheila can ride her bicycle 6000 meters in 15 minutes. How far can she ride her bicycle in 2 minutes?

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• How does current change for resistors in series?

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• Why is the Newton's second law called the equation law?

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• What was wrong with Rutherford's model of the atom?

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• How does acceleration affect tension?

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• What is diffraction of light?

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• How do i convert 1.2kg /m3 into g /cm3?

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• What is the difference between a Joule (J) and an electron volt (eV)?

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• If linear momentum is increased by 50% then how much will the kinetic energy increase by, and why?

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• The acceleration due to gravity on the moon is about one-sixth its value on earth. If a baseball reaches a height of 66 m when thrown upward by someone on the earth, what height would it reach when thrown in the same way on the surface of the moon?

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• What is magnetism?

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• What is the acceleration due to gravity on the surface of a planet that has twice the mass of the Earth and half its radius?

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• What does it mean to say the Kepler's laws are empirical in nature?

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• The force exerted by the floor of an elevator on the foot of a person standing there ,is more than his weight if the elevator is: a-going up and speeding down b-going down and slowing down c-going up and speeding up d-both b and c?

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