Master Physics with Fun Quizzes & Brain Teasers!

As part of a carnival game, a 5.00 kg target is freely hanging from a very long and very light wire. Contestants can use one of two 1.5 kg balls to try to hit the target and deflect it high enough to win a prize. Ball A will have an elastic collision and bounce back toward you while ball B will have a nearly perfectly inelastic collision, but rather than sticking to the target, the ball will just drop straight downward to the ground after the collision. You can throw each ball with a velocity of 12 m/s. You are the first to try the game and which ball should you throw? Calculate the expected height the target will reach after each is thrown.
1 Answer
Compact fluorescent bulbs are much more efficient at producing light than are ordinary incandescent bulbs. They initially cost much more, but last far longer and use much less electricity. According to one study of these bulbs, a compact bulb that produces as much light as a 100 W incandescent bulb uses only 23.0 W of power. The compact bulb lasts 10000 hours, on the average, and costs $ 12.00, whereas the incandescent bulb costs only $ 0.76, but lasts just 750 hours. The study assumed that electricity cost $ 0.090 per kilowatt-hour and that the bulbs were on for 4.0 h per day.Required:a. What is the total cost (including the price of the bulbs) to run each bulb for 3.0 years? b. How much do you save over 3.0 years if you use a compact fluorescent bulb instead of an incandescent bulb? c. What is the resistance of a "100-W" fluorescent bulb?
1 Answer
When you use your senses to gather information you are
1 Answer
Which three factors are used to calculate gravitational potential energy?A. The mass of an objectB. The acceleration of an object due to gravityC. The density of an objectD. The velocity of an objectE. The chemical formula for an objectF. The height of an object
2 Answers
Your car is initially at rest when your hit that gas and the car begins to accelerate at a rate of 2.857 m/s/s. The acceleration lasts for 15.5 s. What is the final speed of the car and how much ground does it cover during this acceleration?
1 Answer
List the 4 things technology can be.
2 Answers
Carbon monoxide (CO) _____.A. is a compound made of oxygen and carbonB. is an elementC. increases in volume when compressedD. is made of two oxygen atoms and two carbon atoms
2 Answers
Igneous rock can be changed into which type of rock through the application of heat and pressure?metamorphic rockclastic sedimentary rocknon-foliated igneous rockfoliated igneous rock
2 Answers
1. Determinar cuanta fuerza es necesaria para empujar un mvil que se encuentra en reposo para que alcance una velocidad de 15 m/s en un tiempo de 20 segundos, considerando que dicho mvil tiene una masa de 1000Kg. No considere que existe friccin.
1 Answer
An escaped convict runs 1.70 km due East of the prison. He then runs due North to a friend's house. If the magnitude of the convict's total displacement vector is 2.50 km, what is the direction of his total displacement vector with respect to due East?
2 Answers
Make a motion chart for a cannonball launched with an initial speed of 20m/s. Neglect drag and the initial height of the cannonball. After the ball lands on the ground enter zero for all speeds and heights if necessary. Use regular metric units (ie. Meters).
1 Answer
The support of the State governments in all their rightsI consider one of the essential principles of our Government How is Jefferson's view reflected in the U.S. Constitution? The U.S. Constitution lists all powers given to the states. The U.S. Constitution gives unlimited power to the states. The U.S. Constitution says powers not given to the federal government belong to the states. The U.S. Constitution gives unlimited power to the federal government and little to the states.
2 Answers
Your car is initially at rest when your hit that gas and the car begins to accelerate at a rate of 2.857 m/s/s. The acceleration lasts for 15.5 s. What is the final speed of the car and how much ground does it cover during this acceleration?
1 Answer
50 POINTS PLSS Your car is initially at rest when your hit that gas and the car begins to accelerate at a rate of 2.857 m/s/s. The acceleration lasts for 15.5 s. What is the final speed of the car and how much ground does it cover during this acceleration?
1 Answer
What happens to the temperature of a substance while it is changing state?A. It increases first and then decreases.B. It decreases first and then remains constant.C. It varies randomly.D. It remains constant.
2 Answers
U WILL GET 25 POINTS PLEASE HELPYour car is initially at rest when your hit that gas and the car begins to accelerate at a rate of 2.857 m/s/s. The acceleration lasts for 15.5 s. What is the final speed of the car and how much ground does it cover during this acceleration?
1 Answer
How to raise the awareness water saving
1 Answer
Which example illustrates Newton's first law?
1 Answer
Engineers are using computer models to study train collisions to design safertrain cars. They start by modeling an elastic collision between two train carstraveling toward each other. Car 1 is traveling east at 6 m/s and has a massof 3,154 kg, Car 2 is traveling west at 23 m/s and has a mass of 8,296 kg.After the collision, car 1 has a final velocity of 7 m/s west. What is the finalvelocity of car 2?A. 18 m/s eastB. 23 m/s westC. 23 m/s eastD. 18 m/s westSUN
2 Answers
A fundraising company agrees to donate an extra $75 for every $100 the school raises through selling cookies. Part A: What is the constant of proportionality
1 Answer
Which of the following would be useful to show the growth rate of plants at varying temperatures?bar graphcircle graphline graphfrequency table
1 Answer
Why is thermal energy classified as kinetic energy?
2 Answers
What's the time it takes a car to attain the speed of 30 m/s when accelerating from rest at 2 m/s (squared)A- 15 sB- 2 sC- 60 sD- 30 sE- none
1 Answer
Dos masas de 8kg es tan unidas en el extremo de una varilla de aluminio de 400mm de longitud. La varilla est sostenida en su parte media hora en crculos y solo puede soportar una tensin mxima de 800 N cul es la frecuencia mxima de revolucin
1 Answer