Master Physics with Fun Quizzes & Brain Teasers!

consider the three hydrogen-atom states 6p , 5d , and 4f . part a which has the highest energy? which has the highest energy? 5 d 4 f 6 p
1 Answer
a ball bounces off the floor. if the ball and ground collision is not perfectly elastic, then the total linear momentum of the ball ground before and after the collision
1 Answer
A positively charged rod is brought near one end of an uncharged metal bar. The end of the metal bar farthest from the charged rod will be chargeda. neutralb. negativec. positived. twice as muche. none of these
1 Answer
a bus with a maximum speed of 20m/s takes 21 sec to travel 270m from stop to stop. Its acceleration istwice as great as its deceleration.Find:A, the accelerationB, the distance traveled at maximum speed
1 Answer
The capacitor in (Figure 1) is initially uncharged and the switch, in position c, is not connected to either side of the circuit. The switch is now flipped to position a for 12 ms , then to position b for 12 ms , and then brought back to position c. Suppose that E = 9 V . What is the final potential difference across the capacitor?
1 Answer
the energy gap in intrinsic silicon is 1.1 ev. assuming the fermi energy lies at the middle of the gap, a. what is the occupation probability at the bottom of the conduction band at 300 k? b. what is the occupation probability at the top of the valence band at 300 k? hint: the answer is not exactly 1.
1 Answer
the solar neutrino problem was solved byquestion 31 options:improving detector efficiencies so more neutrinos were observed.postulating that neutrinos had mass and oscillated between three different types.lowering the percentage of helium in models of solar composition.adjusting the rates of hydrogen burning in solar models.
1 Answer
A block initially at rest on a horizontal, frictionless surface is accelerated by a constant horizontal force of 5.0 newtons. If 15 joules of work is done on the block by this force while accelerating it, the kinetic energy of the block increases by a. 3.0 J b. 15 J c. 20 J d. 75 J
1 Answer
if air that had a temperature of 20c and 8.6 g/kg of water vapor is cooled to 5c and 5g/kg of water vapor, then warmed to 25c, what will be its water vapor content?
1 Answer
Knowing that the allowable normal stress for the steel used is 160 MPa, select the most economical S-shape beam to support the loading shown.
1 Answer
The two forces F?1 and F?2 shown in (Figure 1) act on a 29.0-kg object on a frictionless tabletop. Suppose that F1 = 11.6N , and F2 = 18.8N .The a diagram forms a 90 degree angle with F1 on the negative x axis and F2 on the negative y axis. diagram b has F2 on the positive y axis with F1 in quandrant 4 forming a 120 angle. Determine the magnitude of the net force on the object for the diagram (a) in the figure
1 Answer
Using the distance scale at the bottom of Figure 3.10, measure the distance from the ridge axis to the beginning of the normal polarity period C for each ridge. Place the distances on Figure 3.10. How many kilometers has the left side of each of these ocean basins spread during the past 2 million years?South Atlantic basin = _______km, North Atlantic basin = ______ km, and Pacific basin = _______ km
1 Answer
The uniform load has a mass of 800 kg and is lifted using a uniform 40-kg strongback beam and four wire ropes as shown. Determine the tension in each segment of rope. Give the answer in kN.
1 Answer
refer to the figure and find the volume v generated by rotating the given region about the specified line. a = 3 b = 3 2 about ab
1 Answer
A 23 -kg sphere rests between two smooth planes as shown in Fig, Determine the magnitude of the force acting on the sphere exerted by each plane.
1 Answer
if you answered "yes" to question 1 above, was the orientation achieved through taxis or kinesis?
1 Answer
Signs that might be relevant to Tutankhamun include an abnormal posture of arms and legs, abdominal distension, and weakness, among others. Another disease that ...
1 Answer
a barge containing a tall pile of sand approaches a low bridge and cannot pass under it. should sand be added to the barge or removed in order to allow it to pass? explain.
1 Answer
a fish weighing 16 n is weighed using two spring scales, each of negligible weight, as shown in the figure. what will be the readings of the scales?
1 Answer
At a particular instant the magnitude of the momentum of a planet is 2.05 1029 kg m/s, and the force exerted on it by the star it is orbiting is 9.0 1022 N. The angle between the planet's momentum and the gravitational force exerted by the star is 127.(b) What will the magnitude of the planet's momentum be after 6 h? (Enter your answer to at least four significant figures.)
1 Answer
A 20 kg box is released on a 28 degree incline and accelerates down the incline at 0.26 m/s^2.A. Find the friction force impeding its motion.B. Determine the coefficient of kinetic friction.
1 Answer
A 6.10 F capacitor that is initially uncharged is connected in series with a 4700 resistor and a 502 V emf source with negligible internal resistance.Part AJust after the circuit is completed, what is the voltage drop across the capacitor?Vc = ____ APart BJust after the circuit is completed, what is the voltage drop across the resistor?Vr = _____VPart CJust after the circuit is completed, what is the charge on the capacitor?
1 Answer
where n0 1350 cm2 /v-s, vsat 1.8 107 cm/s, and e is given in v/cm. plot electron drift current density (magnitude) versus electric fi eld (loglog scale) over the range 0 e 106 v/cm
1 Answer
In Figure , a 49kg rock climber is climbing a chimney. The coefficient of static friction between her shoes and the rock is 1.2; between her back and the rock is 0.80. She has reduced her push against the rock until her back and her shoes are on the verge of slipping. (a) Draw a free-body diagram of her. (b) What is the magnitude of her push against the rock? (c) What fraction of her weight is supported by the frictional force on her shoes?
1 Answer