An electron inside a hydrogen atom is confined to within a space of 0.110 nm
What is the minimum uncertainty in the electron's velocity? ( h = 1.055 × 10-34 J ? s, mel = 9.11 × 10-31 kg)
A) 1.05 × 106 m/s
B) 1.05 × 108 m/s
C) 1.50 × 106 m/s
D) 1.05 × 1010 m/s
E) 1.50 × 108 m/s
A
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Which terrestrial world experiences the greatest change between its daytime temperature and night temperature?
A) Mercury B) Venus C) Earth D) Mars E) the Moon
How many joules of energy are required to accelerate one kilogram of mass from rest to a velocity of 0.886c?
A) 1.8 × 1017 J B) 9.0 × 1016 J C) 3.0 × 103 J D) 8.1 × 1021 E) 3.4 × 10-7
A small rubber ball is thrown at an initially stationary bowling ball on a frictionless surface. The rubber ball makes a one-dimensional elastic collision and bounces back along the same line. After the collision, compared to the bowling ball, the rubber ball has
1.a larger magnitude of momentum and more kinetic energy. 2.a smaller magnitude of momentum and less kinetic energy. 3.a smaller magnitude of momentum and more kinetic energy. 4.the same magnitude of momentum and more kinetic energy.
The magnetic field in a region of space is parallel to the surface of a long flat table. Imagine that this page is lying flat on the table. When current is present in the coil, which is lying on the table, the coil tends to rotate so that the left side moves up and the right side moves down. The magnetic field is
a.
directed parallel to the page and downwards.
b.
directed parallel to the page and upwards.
c.
directed parallel to the page and to the right.
d.
directed parallel to the page and to the left.
e.
in a direction that cannot be determined in this experiment