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Questions in physics
📝 Answered - A railroad car with a mass of [tex]1.94 \times 10^4 \, \text{kg}[/tex] moving at [tex]3.28 \, \text{m/s}[/tex] joins with two railroad cars already joined together, each with the same mass as the single car and initially moving in the same direction at [tex]1.02 \, \text{m/s}[/tex]. What is the velocity after the collision and the total kinetic energy lost?
📝 Answered - Explain why dogs pant during hot summer days using the concept of evaporation.
📝 Answered - What type of soil can become as hard as stone when it dries out?
📝 Answered - Mt. Everest is 29,028 feet high. How many miles is this?
📝 Answered - The process in which water, ice, wind, and gravity drop newly formed sediments is called ____.
📝 Answered - You need to get to class, 200 meters away, and you can only walk in the hallways at about 1.5 m/s (if you run any faster, you’ll be caught for running). How much time will it take to get to your class?
📝 Answered - If all of the forces acting on an object balance so that the net force is zero, then: A. the object must be at rest B. the object’s speed will decrease C. the object will follow a parabolic trajectory D. the object’s direction of motion can change, but its speed cannot E. None of the above
📝 Answered - Kelly sits on a rock. Her weight is an action force. Describe the reaction force.
📝 Answered - Which force changes Earth's surface most slowly? A. Earthquake B. Erosion C. Volcano D. Landslide
📝 Answered - How much will you pay for 5 pounds of shrimp if the cost is 2 pounds for $10.99?
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