The "alpha" particle is
A. two electrons bound to two protons.
B. two protons bound to two neutrons.
C. a photon.
D. an electron.
E. two electrons bound to two neutrons.
Answer: B
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A long conducting bar moves with a constant velocity in a uniform magnetic field. The bar and its velocity are perpendicular to the magnetic field as shown. Which of the following statements are true?
A. At steady state there is an electric field in the bar.
B. At steady state there is a current in the bar.
C. At steady state there is a magnetic force on bar.
Projectile Motion: A child throws a ball with an initial speed of 8.0 m/s at an angle of 40° above the horizontal. The ball leaves her hand 1.0 m above the ground and experiences no appreciable air resistance as it moves.(a) How far from where the child is standing does the ball hit the ground?(b) How long is the ball in flight before it hits the ground?(c) What is the magnitude of the ball's velocity just before it hits the ground?
What will be an ideal response?
The mixing of soil by plants and burrowing animals is called
What will be an ideal response?
Three flat layers of transparent material are stacked upon one another. The top layer has index of refraction n1, the middle has n2 and the bottom one has n3 . If n1 < n2 < n3, at what angle of incidence will a ray of light traverse the three layers in a single straight line?
a. ?i = sin–1(1/n1) b. ?i = sin–1(1/(n1+n2+n3) c. ?i = tan–1(1/(n1+n2+n3) d. There is such an angle, but it is not given.