A car has a mass of 2,000 kg and travels at 20.0 m/s. If the drag force is 100 N, the power the engines have to provide to keep moving at constant speed is
A. 2.0 kW.
B. 2.9 kW.
C. 3.4 kW.
D. 3.9 kW.
E. 4.2 kW.
A. 2.0 kW.
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Thermodynamic Devices: A heat pump with a performance coefficient (COP) of 4.9 absorbs heat from the atmosphere at a rate of 29 kW. At what rate is work being done to run this heat pump?
A. 6 kW B. 142 kW C. 113 kW D. 35 kW
Explain how "forbidden" lines appear in spectra of emission nebulae
What will be an ideal response?
Exhibit 7-1
Three 5.0-kg masses are located at points in the xy plane as shown in the figure.
?
?
Use this exhibit to answer the following question(s).
Refer to Exhibit 7-1. What is the magnitude of the resultant force (caused by the other two masses) on the mass at the origin?
A. 2.7 × 10?8 N B. 2.1 × 10?8 N C. 1.8 × 10?8 N D. 2.4 × 10?8 N E. 2.9 × 10?8 N
The colors you see with a prism result because of __________
Fill in the blank(s) with correct word