A 30-kg child rides on a circus Ferris wheel that takes her around a vertical circular path with a radius of 20 m every 22 s. What is the magnitude of the resultant force on the child at the highest point on this trajectory?
A. 49 N
B. 0.29 kN
C. 0.34 kN
D. 0.25 kN
E. 0.76 kN
Answer: A
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If electrons are accelerated from rest in an electron gun by sending them through a potential difference of 1000 V, what is the speed of the electrons?
A. 
B. 
C. 
D. 
E. 
Suppose we take a disk of radius R and remove the material from r = 0 to r = R, making a hole at the center of the disk. Note that this decreases the mass of the disk. Will the value of ? for the new object be larger, smaller, or the same as that for the original object?
A. The value of ? will be larger for the new object. B. The value of ? will be smaller for the new object. C. The value of ? is the same for both objects. D. We need to know the disk’s thickness to answer.
From the center outward, the correct order is
A) liquid iron inner core, solid nickel outer core, rocky mantle, silicate crust. B) solid metallic inner core, molten metal outer core, silicate mantle and crust. C) solid metal core, molten metal hydrosphere, rocky lithosphere, gases in atmosphere. D) solid rock core, liquid metal mantle, solid rock crust. E) molten metal hydrosphere, molten rock lithosphere, solid silicate crust.
A “free” electron and a “free” proton are placed in an identical electric field. Is the following statement true or false?
The magnitude of the acceleration of the electron is greater than that of the proton.
1.False 2.True