A toy rocket, launched from the ground, rises vertically with an acceleration of 20 m/s2 for 6.0 s until its motor stops. Disregarding any air resistance, what maximum height above the ground will the rocket achieve?
a. 1.1 km
b. 0.73 km
c. 1.9 km
d. 0.39 km
e. 1.5 km
A
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A segment of a drive shaft (d 5 200 mm, d 5 160 mm) is sub- 5 # 2 1 jected to a torque T 30 kN m. The allowable shear stress in the shaft is 45 MPa. The maximum permissible compressive load P is approxi-mately:
(A) 200 kN
(B) 286 kN
(C) 328 kN
(D) 442 kN
The change in entropy of a mass m of a solid substance which has a latent heat of fusion LF and melts at a temperature T is
a. LFT/m b. mLF ln(T) c. mLFT d. mLF/T e. LF/mT
The wavelength of the emitted photon if an electron in the hydrogen atom makes a transition from the n = 2 state to the ground state is closest to which of the following values?
(c = 3.0 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J) A) 122 nm B) 203 nm C) 243 nm D) 389 nm E) 411 nm
If the net work done on an object is positive, then the object's kinetic energy
A) decreases. B) remains the same. C) increases. D) is zero. E) cannot be determined without knowing the object's mass.