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Questions in physics

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

📝 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 - Which factor causes gas and dust to pull together during the first stage of star formation? A. density B. gravity C. heat D. pressure

📝 Answered - The loudness, [tex]$L$[/tex], measured in decibels (Db), of a sound intensity, [tex]$l$[/tex], measured in watts per square meter, is defined as [tex]$L=10 \log \frac{l}{l_0}$[/tex], where [tex]$l_0=10^{-12}$[/tex] and is the least intense sound a human ear can hear. What is the approximate loudness of a rock concert with a sound intensity of [tex]$10^{-1}$[/tex]?

📝 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. $78,400 kg$

📝 Answered - The loudness, [tex]$L$[/tex], measured in decibels (Db), of a sound intensity, [tex]$I$[/tex], measured in watts per square meter, is defined as [tex]$L=10 \log \frac{I}{I_0}$[/tex], where [tex]$I_0=10^{-12}$[/tex] and is the least intense sound a human ear can hear. Jessica is listening to soft music at a sound intensity level of [tex]$10^{-9}$[/tex] on her computer while she does her homework. Braylee is completing her homework while listening to very loud music at a sound intensity level of [tex]$10^{-3}$[/tex] on her headphones. How many times louder is Braylee's music than Jessica's? A. [tex]$\frac{1}{3}$[/tex] times louder B. 3 times louder C. 30 times louder D. 90 times louder