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A commuting student leaves home and drives to school at an average speed of 38.0 km/h. After 25.0 min he realizes that he has forgotten his homework and returns home to get it at the same average speed. It takes 10.0 min to discover the report, after which the trip to school 38.0 km away to the east is resumed at the same speed as before.
Describe what is the average speed for the entire trip?
What is the smallest thickness of a soap film (n = 1.33) that would appear black if illuminated with 450 -nm light? suppose there is air on both sides of the soap film.
A nuclear power reactor generates 4.2 × 109 W of power. In one year (365.25 days), what is the change in the mass of the nuclear fuel
A weightlifter curls a 35kg bar, raising it each time a distance of 0.65m. How many times must he repeat this exercise to burn off the energy in one slice of pizza
An 34-kg person puts on a life jacket, jumps into the water, and floats. What is the density of the life jacket
When a converging lens is used in a camera (as in the first drawing), the film must be placed at a distance of 0.170 m from the lens to record an image of an object that is 4.70 m from the lens
A 7.00 \mu F, parallel-plate, air capacitor has a plate separation of 4.50 mm and is charged to a potential difference of 400 V
A cube of ice is taken from the freezer at -8.4^circ C and positioned in a 114 g aluminium calorimeter filled with 322g of water at room temperature of 20.0 C. The final situation is observed to be all water at 15.0C.
When my car has been parked for a while, its tires look a wee bit ‘low,' and, when their pressure is measured at 23 C, What is the temperature of the air inside the tires
an ice cube tray is filled with 75.0 g of water. after the filled tray reaches an equilibrium temperature of 20.0
Describe, in general terms, how we may be able, through some simple experiments, determine the mass of the Earth
A pump is used to empty a 6000{\rm L} wading pool. The water exits the 2.5-cm-diameter hose at a speed of 2.0{\rm m}/{\rm s}
Consider a concave mirror with a focal length of 18.90 cm. Find the location of the image when the object is 10.20 cm from the mirror. What is the magnification of the image? What is the radius of curvature of the mirror in cm? Is is virtual and u..
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