A steel sphere sits on top of an aluminum ring. The steel sphere (? = 1.10 × 10^?5/C°) has a diameter of 8 000 cm at 0°C. The aluminum ring (? = 2.40 × 10^?5/C°) has an inside diameter of 7 991 cm at 0°C. Closest to which temperature given will the sphere just fall through the ring?
a. 47°C
b. 102°C
c. 87°C
d. 108°C
e. 65°C
c
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An electron with velocity v = 2.0 × 106 m/s is sent between the plates of a capacitor where the electric field is E = 200 V/m. If the distance the electron travels through the field is 1.0 cm, how far is it deviated (Y) in its path when it emerges from the electric field? (me = 9.1 × 10?31 kg, e = 1.6 × 10?19 C)
a.
0.84 mm
b.
0.44 mm
c.
0.44 cm
d.
0.84 cm
e.
1.4 mm
Beats: Two police cars have identical sirens that produce sound of frequency of 570 Hz. A stationary listener is standing between two cars. One car is parked and the other is approaching the listener and both have their sirens on. The listener measures 9.0 beats per second. Find the speed of the approaching police car. The speed of sound is 340 m/s.
Fill in the blank(s) with the appropriate word(s).
A plane stress element on a bar in uniaxial stress has a tensile stress of ?? 5 78 MPa (see figure). The maximum shear stress in the bar is approximately:
(A) 29 MPa
(B) 37 MPa
(C) 50 MPa
(D) 59 MPa
Consider a situation where a constant force of 25 N acts on an object having a mass of 2 kg for 3 seconds.What is the magnitude of the change in the object's momentum?
a. 150 kg m/s b. 50 kg m/s c. 75 kg m/s d. undetermined—not enough information given e. none of the above