Answers edited by Mark C.

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• How is the Cepheid yardstick validated?
  
• Question #1623a
  
• Question #f382a
  
• Question #a38db
  
• Question #6d346
  
• Question #b953c
  
• Question #c53b8
  
• When gunpowder ignites it burns rapidly. What can be done to gunpowder to make it explode with greater force?
  
• Question #83ae6
  
• Question #1e9db
  
• What is the study of asteroseismology? Why do astrophysicists study this field?
  
• Question #f608f
  
• Question #4ce19
  
• Question #4acd6
  
• Question #3a077
  
• Question #52997
  
• How many miles is it to the nearest galaxy?
  
• Question #0b8e1
  
• Explain why a lawn mower turn when pushed are an angle from a sidewalk onto the grass?
  
• Question #22749
  
• Use the elimination method please?/ Thanks!
  
• Question #315b8
  
• Why do cartographers need to use projections when drawing maps?
  
• Question #444db
  
• Question #7e322
  
• Question #e98c0
  
• Distance covered by an oscillating body in terms of amplitude is a) A b) 2A c) 3A?
  
• As time period doesnot depend on amplitude so then why it is said that in measurement of time period amplitude must be kept small and also that amplitude must be zero ?
  
• What is the maximum height above the ground for a the gymnast jumping straight upward with initial speed of 10 m/s?
  
• Question #64d80
  
• A bolt of lightning discharges 9.7 C in #8.9 x 10^-4# s. What is the average current during the discharge?
  
• A ball is free falling from a 60 m tall building. What is the time it will take to hit the ground ?
  
• Why is flatness a problem is cosmology?
  
• The sun formed out of a?
  
• Give a physical quantity which has no units ?
  
• Is precession the cause of global warming?
  
• How does electromagnetic energy differ from other energy sources?
  
• Why is there an absence of sunlight on the Earth's polar regions for long periods of time during the winter months?
  
• The speed of a stream is 5 mph. A boat travels 10 miles upstream in the same time it takes to travel 20 miles downstream. What is the speed of the boat in still​ water?
  
• A sailboat weighing 1,960 N moves at 3 m/s for 10 minutes. What is the value for the work of the sails?
  
• Question #dd8b5
  
• A ball has a mass of 4.0 kg and is moving with a velocity of 15.0 km/h. The ball increased its speed to 30.0 Km/h, then the K.E of the ball will ?
  
• Question #0a4d8
  
• Question #6d7fc
  
• Question #a5ffc
  
• You do work when you lift the pizza boxes. You do NO work ( in the physics sense ) when you carry the pizza boxes. WHY?
  
• How does the structure of the earth affect us?
  
• How much are sea levels expected to rise in the next century?
  
• Is there other intelligent life in our galaxy or an alternate universe?
  
• Suppose you did a lab with this simple circuit and got the following data. Plot the points of the provided graph?
  
• Approximately, what basic composition are all stars born with?
  
• What is a mixture in which particle size averages between 1 nm and 1000 nm?
  
• What is the specific heat capacity of aluminum in joules? And how do you find it?
  
• Question #15f2d
  
• Question #447b0
  
• Question #84bba
  
• If your computer uses 3.5 A at 110 V, how much will it cost to use the computer for 3 hours a day, seven days a week for two weeks? Assume that the cost of electricity is $0.09 for every kW•h of energy.
  
• Question #dd1a6
  
• If mass of a planet is greater than the its G Will be greater?
  
• Question #640a9
  
• Einstein showed what could be explained if photons carried quantized amounts of energy?
  
• What role do chemosynthetic bacteria play in deep-sea volcanic-vent ecosystems?
  
• Question #87314
  
• Question #cca84
  
• Question #768fb
  
• If two asteroids moved closer together, what would be the result on the gravitational force each asteroid exerts on the other?
  
• What is true about an electric field around a positive charge?
  
• What does a tectonic plate consist of?
  
• What does the large scale structure of the universe look like? Explain why we think this structure reflects the density patterns of the early universe.
  
• How is the universe expanding?
  
• Question #fd518
  
• Question #3e7ef
  
• What are the Northern Lights?
  
• Question #4d545
  
• Would the Milankovitch cycle account for the changes we are seeing on this planet and are now attributed to global warming caused by man's impact on this planet?
  
• What is the temperature at the point where the universe is expanding?
  
• What is the work Ww done on the box by the weight of the box?
  
• What are the primary roles of each of the fundamental forces?
  
• Question #94a89
  
• Question #a85e9
  
• The height from which the body is released is numerically equal to the velocity accquired find the that height is equal to ? Ans:2g
  
• Can someone check my work please? I feel like I didn't do a good job on that :)
  
• Question #b0b36
  
• How do you calculate the wavelength of a helium-neon laser that says 95mW on it?
  
• A circular piston exerts a pressure of 80 k Pa on a fluid, when the force applied to the piston is 0.2kN. What is the diameter of the piston ?
  
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