A ball is thrown at an original speed of 8.0 m/s at an angle of 35° above the horizontal. If there is no air resistance, what is the speed of the ball when it returns to the same horizontal level?
A) 4.0 m/s
B) 8.0 m/s
C) 16 m/s
D) 9.8 m/s
B
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Which of the following is an example of baryonic matter?
A) you B) the particles produced by physicists in particle accelerators C) electrons and positrons produced by pair production D) WIMPs E) neutrinos
A charge of +3.0 mC is distributed uniformly along the circumference of a circle with a radius of 20 cm. How much external energy is required to bring a charge of 25mC from infinity to the center of the circle?
a. 5.4 J b. 3.4 J c. 4.3 J d. 2.7 J e. 6.8 J
A roller-coaster car has a mass of 500 kg when fully loaded with passengers. At the bottom of a circular dip of radius 40 m (as shown in the figure) the car has a speed of 16 m/s. What is the magnitude of the force of the track on the car at the bottom of the dip?
A. 3.2 kN B. 8.1 kN C. 4.9 kN D. 1.7 kN E. 5.3 kN
An electron is in an infinite square well (a box) that is 8.9 nm wide
What is the ground state energy of the electron? (h = 6.626 × 10-34 J ? s, mel = 9.11 × 10-31 kg, 1 eV = 1.60 × 10-19) A) 0.0048 eV B) 0.0057 eV C) 0.0066 eV D) 0.0076 eV E) 0.0085 eV