The horizontal and vertical components of the initial velocity of a football are 16 m/s and 20 m/s respectively. How long does it take for the football to rise to the highest point of its trajectory?
A) 1.0 s
B) 2.0 s
C) 3.0 s
D) 4.0 s
E) 5.0 s
B
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Carnot Engine: An ideal Carnot engine operating between a warm reservoir of unknown temperature and a cold reservoir at 1.76 K has an efficiency of 11.0%. What is the temperature of the warm reservoir?
A. 1.98 K B. 0.180 K C. 157 K D. 0.160 K
Why doesn't the Moon have an atmosphere?
A. The blasts that formed the craters blew it away. B. The Moon's atmosphere was drawn away from it by Earth's stronger gravitational force. C. It had very few volcanoes and the gravity is too weak to hold a substantial atmosphere. D. The solar wind evaporated the Moon's atmosphere.
Irr II galaxies may be the result of a collision, or close encounter, of two normal galaxies
Indicate whether the statement is true or false
An ideal solenoid having 200 turns and carrying a current of 2.0 A is 25 cm long. What is the magnitude of the magnetic field at the center of the solenoid? (?0 = 4? × 10-7 T ? m/A)
What will be an ideal response?