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Questions in physics

[Answered] The force, [tex]$F$[/tex], between two objects is inversely proportional to the square of the distance between them. The distance between two objects is increased by [tex]$50 \%$[/tex]. Calculate the percent reduction in the force between the objects.

[Answered] An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

[Answered] An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

[Answered] You are using the volume displacement method to measure the volume of a sphere. You have obtained the following: Initial volume of water - 500 ml Final volume of water - 835 ml What is the volume of the sphere in liters? (Use the correct unit abbreviation in your answer)

[Answered] What is a solenoid? A. a current-carrying wire with many coils B. a current-carrying wire that is straight C. a tool used to measure magnetism D. a tool used to measure current

[Answered] Which theoretical approaches covered in Chapter 4 in my group proposal do you think you will employ in your group? Why?

[Answered] A soccer ball is traveling at a velocity of $50 m / s$. The kinetic energy of the ball is 500 J. What is the mass of the soccer ball? (Formula: $K E=\frac{1}{2} m v^2$) A. 0.1 kg B. 0.2 kg C. 0.4 kg D. 0.5 kg

[Answered] Which of the following is true about fixed ladders? A. They must have safety devices if the ladder extends more than 18 feet above a surface. B. Each rung must be able to support 175 pounds. C. All safety devices must be activated within 2 feet of a fall. D. All safety devices must be activated within 4 feet of a fall.

[Answered] The force, [tex]F[/tex], between two objects is inversely proportional to the square of the distance between them. The distance between two objects is increased by [tex]50 \%[/tex]. Calculate the percent change in the force between the objects. [tex]\begin{array}{l} F=\frac{k}{d^2} \\ F=\frac{k}{d(1.5 d)^2} \\ F=\frac{k}{2.25} d^2 \end{array}[/tex]

[Answered] A roller coaster with a potential energy of $235,200 J$ sits at the top of a 30 m high hill. What is the mass of the roller coaster? (Formula: $P E=m g h$) A. 800 kg B. $7,840 kg$ C. $8,000 kg$ D. $78,400 kg$