A 50-gram ball moving +10 m/s collides head-on with a stationary ball of mass 100.g. The collision is elastic. What is the speed of each ball immediately after the collision?
What will be an ideal response?
-3.3 m/s and +6.7 m/s
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Power: A 1321-kg car climbs a 5.0° slope at a constant speed of 80.0 km/h. Assuming that air resistance may be neglected, at what rate (in kW) must the engine deliver energy to the drive wheels of the car?
A. 25 kW B. 288 kW C. 38 kW D. 48 kW
Under what circumstances can differentiation occur in a planet?
A) The planet must have a rocky surface. B) The planet must be made of both metal and rock. C) The planet must have an atmosphere. D) The planet must be geologically active, that is, have volcanoes, planetquakes, and erosion from weather. E) The planet must have a molten interior.
Transits of multiple planet systems can be analyzed to infer planetary masses
Indicate whether the statement is true or false
A 50-kg box is resting on a horizontal floor. A force of 250 N directed at an angle of 30.0° below the horizontal is applied to the box
The coefficient of static friction between the box and the surface is 0.40, and the coefficient of kinetic friction is 0.30. What is the force of friction on the box? A) 250 N B) 200 N C) 32 N D) 620 N E) 220 N