A person weighing 0.70 kN rides in an elevator that has an upward acceleration of 1.5 m/s2 . What is the magnitude of the force of the elevator floor on the person?
a. 0.11 kN
b. 0.81 kN
c. 0.70 kN
d. 0.59 kN
e. 0.64 kN
B
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A proton in a certain particle accelerator has a kinetic energy that is equal to its rest energy. What is the momentum of the proton as measured by a physicist working with the accelerator? (c = 3.00 × 108 m/s, mproton = 1.67 × 10-27 kg)
A) 2.51 × 10-19 kg ? m/s B) 2.89 × 10-19 kg ? m/s C) 4.34 × 10-19 kg ? m/s D) 5.01 × 10-19 kg ? m/s E) 8.68 × 10-19 kg ? m/s
Three charges QA = -2.0 ?C, QB= 6.0 ?C, and QC= -4.0 ?C are located along the y-axis at yA= -4.0 cm, yB = 0, and yC = 2.0 cm respectively. Calculate the electric potential at the point x = 6.0 cm on the x-axis
A) 0.81 × 105 V B) -0.81 × 105 V C) 0.41 × 105 V D) 0 E) -0.41 × 105 V
What is the celestial sphere?
A. Earth B. an observatory dome C. the Sun D. the imaginary sphere of the sky, on which stars lie
A flat rectangular loop of wire carrying a 4.0-A current is placed in a uniform 0.60-T magnetic field. The magnitude of the torque acting on this loop when the plane of the loop makes a 30° angle with the field is measured to be 1.1 N ? m
What is the area of this loop? A) 0.80 m2 B) 0.53 m2 C) 0.40 m2 D) 0.20 m2 E) 0.26 m2