The horizontal component of the velocity of a projectile remains constant during the entire trajectory of the projectile
Indicate whether the statement is true or false
TRUE
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A singly charged 9Be ion is accelerated from rest through a potential difference of 8000 V. The ion is then sent into a mass spectrometer where the radius of the path is 29 cm. What is the magnetic field in the spectrometer?
A. 0.27 T B. 0.13 T C. 0.067 T D. 0.0028 T E. 0.00019 T
Conduction: A heat-conducting rod, 0.90 m long and wrapped in insulation, is made of an aluminum section that is 0.20 m long and a copper section that is 0.70 m long. Both sections have a cross-sectional area of 0.00040 m2. The aluminum end and the copper end are maintained at temperatures of 30°C and 230°C, respectively. The thermal conductivities of aluminum and copper are 205 W/m ? K (aluminum) and 385 W/m ? K (copper). What is the temperature of the aluminum-copper junction in the rod with steady state heat flow?
A. 100°C B. 93°C C. 86°C D. 80°C E. 74°C
A string with a mass per length of 2.00 gm/m is stretched with a force of 150 N between two points that are 0.500 m apart. The frequency of the second mode of the stretched string is in tune with the fundamental frequency of an organ pipe filled with air and open at both ends. The velocity of sound in air at 0
is 331 m/s. What is the length of the organ pipe?
A. 43.6 cm B. 40.1 cm C. 37.5 cm D. 35.6 cm E. 30.2 cm
A Doppler red shift indicates
a. a shift toward lower frequencies. b. a shift toward shorter wavelengths. c. that a light source is approaching relative to the observer. d. none of these.