An airplane starts from rest and accelerates at a constant 10.8 m/s2. What is its speed at the end of a 400 m-long runway?
A) 4320 m/s B) 93.0 m/s C) 37.0 m/s D) 186 m/s E) 65.7 m/s
B
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First Law of Thermodynamics: A cylinder contains 13 moles of an ideal gas at a temperature of 300 K. The gas is compressed at constant pressure until the final volume equal 0.70 times the initial volume. The molar heat capacity at constant volume of the gas is 24.0 J/mol ? K. What is the change in the internal (thermal) energy of the gas during this process? (R = 8.31 J/mol ? K)
A. -28 kJ B. -38 kJ C. 28 kJ D. 38 kJ E. -9.7 kJ
A car is traveling north at After 12 s its velocity is in the same direction. Find the magnitude and direction of the car's average acceleration
A) 0.30 m/s2, south B) 2.7 m/s2, south C) 0.30 m/s2, north D) 2.7 m/s2, north
Rubidium (Z = 37) and potassium (Z = 19) are similar to sodium in that they have ____ electron(s) in the outermost shell
a. five p b. three p c. two s d. one d e. one s
A 1 000-V battery, a 3 000-? resistor, and a 0.50-?F capacitor are connected in series with a switch. The time constant for such a circuit, designated by the Greek letter, ?, is defined as the time that the capacitor takes to charge to 63% of its capacity after the switch is closed. What is the current in the circuit at a time interval of ? seconds after the
switch has been closed?
a.
0.14 A
b.
0.21 A
c.
0.12 A
d.
0.32 A