You push downward on a box at an angle 25° below the horizontal with a force of 750 N. If the box is on a flat horizontal surface for which the coefficient of static friction with the box is 0.76,
what is the mass of the heaviest box you will be able to move?
A) 59 kg
B) 68 kg
C) 54 kg
D) 82 kg
A
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Which type of star has the strongest stellar winds?
A) giant K- and M-type stars B) white dwarfs C) dwarf K- and M-type stars D) main sequence O- and B-type stars E) T Tauri stars
A He-Ne laser, which produces light of wavelength 632.8 nm, is used to calibrate a diffraction grating. If the first-order maximum occurs at 20.5° from the central spot, what is the distance between the slits of the grating?
A) 0.905 µm B) 1.81 µm C) 2.20 µm D) 3.62 µm E) 4.52 µm
The force on a 0.500-kg particle depends on position such that F(x) = (1.00 N/m2)x2 + ( 4.00 N/m)x for a particle constrained to move along the x-axis
If the particle starts from rest at x = 0.00, what will be its speed when it reaches the position x = 4.00 m? A) 1.65 m/s B) 22.6 m/s C) 14.6 m/s D) 11.3 m/s E) The particle will not reach the position x = 4.00 m.
An experimenter is involved in four of the five tasks below. Select the exception
a. revises a hypothesis as a result of data collected b. manipulates dependent variables c. reviews other research results obtained by other scientists d. examines the effects of independent variables e. draws conclusions based only on appropriate experimental data