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The flowers of the bunchberry plant open with astonishing force and speed, causing the pollen grains to be ejected out of the flower in a mere 0.30 ms at an acceleration of 2.5×104 m/s2. With what speed are pollen grains ejected from a bunchberry flower?
You are standing 2.5 {rm m} straight in front of one of the two loudspeakers. They are 3 {rm m} apart and both are playing a 686 {rm Hz} tone in phase. As you begin to walk directly away from the speaker, at what distances from the speaker do you ..
Discuss briefly centripetal acceleration, the speed and the force exerted by a ball attached to a string.
How much work did movers do (horizontally) pushing a 140{rm kg} crate 10.60 m across a rough floor without acceleration, if the effective coefficient of friction was 0.700.
A professor's office door is 0.90 wide, 2.00 high, 4.00 thick; has a mass of 30, and pivots on frictionless hinges. A "door closer" is attached to door and the top of the door frame. When the door is open and at rest, the door closer exerts the torqu..
Explain by how much upward force does each support exert on the beam? (Enter your answer for support 1 first, followed by your answer for support 2.)
A rectangular container measuring 10cmx20cmx25cm is filled with gas. What is the mass volume of water in kilograms.
define the speed with which the cart reaches positions 3, 2, and 1 (in that order). Neglect friction. Let g = 9.81 m/s2.
An asteroid is discovered heading straight toward Earth at 14km/s. An international team manages to attach a giant rocket engine to the asteroid. The rocket fires for 10 {rm min}, after which asteroid is moving at 26^circ to its original path at a..
A light ray enters a glass slab at point A at an angle of 57.6° with respect to the surface normal and then undergoes total internal reflection at point B. What minimum value for the index of refraction of the glass can be inferred from this?
Calculate the total cost ($/kWh) of electricity delivered to the grid including fuel cost and debt charge with O&M of 5% added to the total.
A tank of water 3.0 m deep sits on a table 1m tall. A hole is located 2m from the bottom of the tank. Water flows out of hole and strikes the ground. Where does it strike the ground? Suppose incompressible, non viscous flow.
A dish of hot food has an emissivity of 0.40 and emits 20 W of thermal radiation. If you wrap it in aluminium foil, which has an emissivity of 0.008, how much power would it radiate.
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