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Questions in physics

[Open]What particles make up a plasma of hydrogen?

[Open]The initial speed of a body is 2.98 m/s. What is its speed after 1.6 s if it accelerates uniformly at 2.51 m/s²? Answer in units of m/s. What is its speed after 1.6 s if it accelerates uniformly at −2.51 m/s²? Answer in units of m/s.

[Open]At a certain instant, an object is moving to the right with a speed of 1.0 m/s and has a constant acceleration to the left of 1.0 m/s². At what later time will the object momentarily be at rest?

[Open]What type of charge does a proton have?

[Open]A fire hose ejects a stream of water at an angle of [tex]36.3^\circ[/tex] above the horizontal. The water leaves the nozzle with a speed of [tex]21.9 \, \text{m/s}[/tex]. Assuming that the water behaves like a projectile, how far from a building should the fire hose be located to hit the highest possible fire?

[Open]How can you tell if a mountain valley was formed by a stream or a glacier?

[Open]A hiker hikes in a straight line and maintains a constant velocity of +0.5 m/s. At time [tex]t = 0.0 \, \text{s}[/tex], the hiker is 30 m from point A. What is the displacement from point A at [tex]120 \, \text{s}[/tex]?

[Open]What do you call the procedure that helps you determine the volume of an irregularly shaped object using a graduated cylinder?

[Open]A cube of ice, 12 cm on each side, is melted into a measuring cup. What is the volume of the liquid water? (Note: To find the volume of the cube, use the formula \( \text{Volume} = \text{side}^3 \).)

[Open]A marble is fired horizontally from a launching device attached to the edge of a tabletop which is 94.0 cm above the floor. The marble then strikes the floor 2.35 meters from the edge of the table. What is the initial velocity of the marble as it leaves the launching device?