An alpha particle is moving at a speed of 5.0 × 105 m/s in a direction perpendicular to a uniform magnetic field of strength 0.040 T. The charge on an alpha particle is 3.2 × 10-19 C and its mass is 6.6 × 10-27 kg
(a) What is the radius of the path of the alpha particle? (b) How long does it take the alpha particle to make one complete revolution around its path?
(a) 0.26 m (b) 3.2 µs
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A flatbed truck is carrying a 20.0-kg crate along a level road. The coefficient of static friction between the crate and the bed is 0.400. What is the maximum acceleration that the truck can have if the crate is to stay in place?
A) 3.92 m/s2 B) 7.84 m/s2 C) 8.00 m/s2 D) 78.5 m/s2 E) 196 m/s2
A particle (charge = +40 ?C) is located on the x axis at the point x = ?20 cm, and a second particle (charge = ?50 ?C) is placed on the x axis at x = +30 cm. What is the magnitude of the total electrostatic force on a third particle (charge = ?4.0 ?C) placed at the origin (x = 0)?
a. 41 N b. 16 N c. 56 N d. 35 N e. 72 N
If the Sun's surface were cooler, how would its appearance change?
A) It would appear more red. B) It would appear more blue. C) It would become bright white. D) It would stay the same.
Series/Parallel Circuits: A 4.0-? resistor is connected to a 12-? resistor and this combination is connected to an ideal dc power supply with voltage V as shown in the figure. If the total current in this circuit is I = 2.0 A, what is the value of voltage V?
A. 2.0 V B. 3.0 V C. 6.0 V D. 1.5 V E. 8.0 V