Statistics-UG Welcome to your Statistics-UG Name Email 1. A snowball is thrown from a height of 2 m above the ground at a velocity of 10 m/s, directed at an angle of 30° above the horizontal. How long will the snowball be in the air until it reaches the ground? 1.41 s 1.31 s 1.37 s 1.22 s2. A point charge Q is fixed at the center of an uncharged conducting spherical shell of inner radius a and outer radius b. What is the value of the potential Va at the inner surface of the spherical shell? 0 3. How much current must be flowing through a horizontal 20.0-meter-long wire suspended in a 5.0 T magnetic field if the wire has a mass of 0.20 kg? 0.020 A 2.0A 1.2 A 0.46 A4. 5. In an optically perfect lens, the size of the focal spot is limited only by diffraction effects. A parallel light of wavelength 550 nm is incident on an optically perfect lens. The diameter and focal length of the lens are 10 cm and 18 cm, respectively. In the diffraction pattern, what will be the angular width of the first minimum and the corresponding linear width at the focal distance? (4.84 x 10-4)°, 2.2 x 10-6 m (3.84 x 10-4)°, 1.2 x 10-6 m (2.84 x 10-4)°, 3.2 x 10-6 m (3.64 x 10-4)°, 1.8 x 10-6 m6. A sound source is moving away from a stationary observer. The frequency of the sound heard by the observer is 8% lower than the frequency of sound emitted by the source. Assume the speed of sound is 344 m/s. What is the speed of the source? 54.8 m/s 59.8 m/s 27.4 m/s 29.9 m/s7. A vehicle is approaching a hill traveling at a speed of 75 km/h. The engine of the vehicle emits a whistle sound with a frequency of 420 Hz. The whistle sound reflects off of the hill, and the echo is heard by the driver of the vehicle. Assuming the speed of the sound in air is 331 m/s, what is the frequency of the echo heard by the driver? 476 Hz 447 Hz 480 Hz 470 Hz8. Which of the following terms does NOT describe how light is emitted? spatially coherently temporally coherently fluorescently diffractively9. A lab technician needs to raise the temperature of 250 ml of water from 30.0°C to 100.0°C. What is the heat required to raise the temperature of the water? Note: the density of water is 1.00 g/ml, and the specific heat of water is 4.184 J/g•°C. 75.2 kJ 73.2 kJ 81.3 kJ 98.4 kJ10. A 3,000 kg bulldozer is moving at 50.0 km/h, and it runs into a 1,000 kg parked car, locking the two together. What is the final velocity of the two vehicles? 37.5 km/h 13.3 km/h 28.2 km/h 41.8 km/h By driveini-admin|2020-11-17T16:36:04+05:30November 17th, 2020|0 Comments Share This Story, Choose Your Platform! FacebookTwitterLinkedInRedditWhatsAppTumblrPinterestVkXingEmail About the Author: driveini-admin Leave A Comment Cancel replyComment Save my name, email, and website in this browser for the next time I comment.