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Questions in physics

[Answered] Which of the following most likely has a fixed shape? A. Helium gas B. Solid iron C. Liquid octane D. Hydrogen plasma

[Answered] The vertical height of an ocean wave from crest to trough is 10 meters. What is the amplitude of the ocean wave?

[Answered] Measuring the size of a specific object might include which of these SI units? A. meter, sound B. candela, mole C. kilogram, ampere D. meter, kilogram

[Answered] Our understanding of the atom has changed over time. Which idea that was once accepted is now considered scientifically inaccurate? A. The nucleus is the center of the atom. B. An atom is solid material. C. Electrons have a negative charge. D. Electrons are arranged in layers.

[Answered] What are two things that the amount of gravitational force between two objects depends on?

[Answered] A roller coaster car rapidly picks up speed as it rolls down a slope. As it starts down the slope, its speed is 4 m/s. But 3 seconds later, at the bottom of the slope, its speed is 22 m/s. What is the car’s acceleration?

[Answered] In 2 seconds, a ball travels 100 cm. What is the average speed of the ball?

[Answered] Contrast inference and prediction. Inference involves drawing conclusions based on evidence and reasoning from the text or situation at hand. Prediction, on the other hand, involves making an educated guess about what will happen in the future based on current information or patterns.

[Answered] "A horse pulls on a cart. By Newton’s third law of motion, the cart pulls back on the horse with a force equal to that exerted by the horse on the cart. The sum of the forces is zero. Therefore, it follows that it is not possible for the horse to accelerate the cart." Is this argument correct? Explain fully.

[Answered] Convert 1 mm of Hg into Pascals. Take the density of Hg as [tex]13.6 \times 10^3 \, \text{kg/m}^3[/tex]. Use [tex]g = 9.8 \, \text{m/s}^2[/tex].