If the Moon is too far from Earth during a solar eclipse, the _____ does not reach Earth's surface
a. umbra
b. ecliptic
c. prominence
d. penumbra
e. solar disk
a
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Mass on a Spring: A 1.5-kg cart attached to an ideal spring with a force constant (spring constant) of 20 N/m oscillates on a horizontal, frictionless track. At time t = 0.00 s, the cart is released from rest at position x = 10 cm from the equilibrium position.(a) What is the frequency of the oscillations of the cart?(b) Determine the maximum speed of the cart. Where does the maximum speed occur?(c) Find the maximum acceleration of the mass. Where does the maximum acceleration occur?(d) How much total energy does this oscillating system contain?(e) Express the displacement as a function of time using a cosine function.
What will be an ideal response?
Matter Waves: Electrons with a speed of 2.1 × 106 m/s are directed towards a 1.0-?m wide slit. An electron detector is placed 1.0 m behind the slit. How wide is the central maximum of the electron diffraction pattern on the detector? (h = 6.626 × 10-34 J ? s, melectron = 9.11 × 10-31 kg)
A. 690 ?m B. 350 ?m C. 1000 ?m D. 1400 ?m
All the following statements are true. Which one is most important in explaining the tremendous tidal heating that occurs on Io?
A) Io orbits Jupiter on an elliptical orbit as a result of orbital resonances with other moons. B) Io is the closest to Jupiter of Jupiter's large moons. C) Io exhibits synchronous rotation, meaning that its rotation period and orbital period are the same. D) Io orbits Jupiter in the Io torus, and therefore has a surface that is bombarded by many charged particles.
A barefoot field-goal kicker imparts a speed of 30 m/s to a football at rest. If the football has a mass of 0.45 kg and time of contact with the football is 0.035 s, what is the force exerted on the foot?
a. 14 N b. 13 N c. 390 N d. 860 N e. 900 N