A projectile is shot from the surface of Earth by means of a very powerful cannon. If the projectile reaches a height of 35,000 m above Earth's surface, what was the speed of the projectile when it left the cannon?
A)
355 m/s
B)
505 m/s
C)
827 m/s
D)
710 m/s
E)
906 m/s
C
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A charge (uniform linear density = 9.0 nC/m) is distributed along the x axis from x = 0 to x = 3.0 m. Determine the magnitude of the electric field at a point on the x axis with x = 4.0 m
a. 81 N/C b. 74 N/C c. 61 N/C d. 88 N/C e. 20 N/C
Equilibrium: A uniform rod weighs 40 N and is 1.0 m long. It is hinged to a wall at the left end, and held in a horizontal position at the right end by a vertical string of negligible weight, as shown in the figure. What is the magnitude of the torque due to the string about a horizontal axis that passes through the hinge and is perpendicular to the rod? The hinge is very small with negligible friction.
A. 40 N ? m B. 10 N ? m C. 5.0 N ? m D. 20 N ? m E. 30 N ? m
One light-minute is the distance light travels in one minute. The speed of light is about 300,000 km/s (3×105 km/s). How far is one light-minute?
A) 300 thousand km (300,000, or 3 × 105 km) B) 9.46 trillion km (9,460,000,000,000, or 9.46 × 1012 km) C) 1.08 billion km (1,080,000,000, or 1.08 × 109 km) D) 18 million km (18,000,000, or 1.8 × 107 km)
The bending of distant starlight by a closer object, resulting in a temporary brightening of the star, is called ________
Fill in the blank(s) with correct word