Category: Physics

Can a body have negative displacement but positive velocity? REASONING AND SOLUTION It is possible for the instantaneous velocity at any point during a trip to have a negative value, even though the average velocity for the entire trip has a positive value. The average velocity for the trip is the displacement for the trip […]

Why does convection occur in air? Convection happens because warm air is less dense than the cold air around it, so it is lighter and rises or goes up in the atmosphere. There is a constant balancing act going on all the time in our atmosphere as moist, warm air goes upward and cooler, denser […]

Are Polarized sunglasses good for night driving? Why night driving glasses might be a bad idea This is because the yellow tint blocks some blue light from sunlight. In fact, these darker tints can block significantly more blue light than yellow lenses — but they also prevent more light from entering the eye, which reduces […]

What causes tides to rise and fall? The tides–the daily rise and fall of the sea’s edge–are caused by the gravitational forces between the earth, the moon and the sun. Since the moon is closer to our planet than the sun, it exerts a stronger gravitational pull on us. (The sun only has 46% of […]

Which metal has lowest specific heat capacity? Substance Specific Heat Capacity at 25oC in J/goC tin 0.21 lead 0.160 mercury 0.14 gold 0.129 What is specific heat capacity of copper? Some common specific heats and heat capacities: Substance S (J/g 0C) C (J/0C) for 100 g Copper 0.385 38.5 Gold 0.129 12.9 Iron 0.450 45.0 […]

What is current draw test? A starter current draw test provides a quick check of the entire starting system. With the Sun VAT-40 tester, it also checks battery’s cranking voltage. If another type of tester is used, follow the manufacturer’s recommended procedure. What does a voltage drop test? A voltage drop test can be used […]

What is the change of state from a gas to a liquid? Condensation What are 10 examples of sublimation? Ten examples of sublimation: Dry ice sublimes. Snow and ice sublime during winter season without melting. Moth balls sublime. Room fresheners which are used in toilets sublimes. Frozen foods will sublime and you will find ice […]

What are three examples of important trade offs that you face in your life? 1) after opening the eye at first and of deciding that this world is our rival or a friend. 2) choosing the streams English or commerce or Science. 3) death as the trade off that we have to face in our […]

What are the 7 steps of problem-solving? Here are seven-steps for an effective problem-solving process. Identify the issues. Be clear about what the problem is. Understand everyone’s interests. List the possible solutions (options) Evaluate the options. Select an option or options. Document the agreement(s). Agree on contingencies, monitoring, and evaluation. What are two ways to […]

How do you control a car when skidding? Most skids occur when conditions are slippery. If you find yourself in a skid, take your feet off the pedals. Stop braking and stop accelerating. Then, quickly turn the steering wheel in the direction you want to go. What should you do if you experience brake failure? […]