A skater holds her arms outstretched as she spins at 170 rpm. What is the speed of her hands if they are 155 cm apart?
Why do many people believe they must choose between science and religion?
Estimate the number of electrons present in a (neutral) 1.2 kg block of carbon.
while a car travels around a circular track, at constant speed, its
To win the game, a place kicker must kick a football from a point 38 m (41.5568 yd) from the goal, and the ball must clear the crossbar, which is 3.05 m high. When kicked, the ball leaves the ground with a speed of 21 m/s at an angle of 40.9 from the horizontal. The acceleration of gravity is...
Galactic Motion How fast is a galaxy moving relative to Earth if a hydrogen spectral line of 486 nm is red-shifted to 491 nm?
suppose a snack bar is burned in a calorimeter and heats 2000g water by
determine the force needed to accelerate a 1357 kg car foward at 8.0 m/s2
what is a vigina?
A 2.25 104 elevator is to be accelerated upward by connecting it to a counterweight using a light (but strong!) cable passing over a solid uniform disk-shaped pulley. There is no appreciable friction at the axle of the pulley, but its mass is 850 and it is 1.50 in diameter. a)How heavy...
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1. Can you show me step by step how to solve this problem?:
- The Earth’s rate of rotation is constantly decreasing, causing the day to increase in duration. In the year 2000 the Earth takes about 0.548 s longer to complete 365 revolutions than it did in the year 1900.
- (a) What is the average angular acceleration of the Earth?
- (b) If this average acceleration remains constant, in what year will the Earths rotation come to rest?
2. I do not understand this Ideal Gas Law and Kinetic Theory question. Can you help me set it up?
- A spherical balloon is made from a material whose mass is 3.00-kg. The thickness of the material is negligible compared to the 1.5-m radius of the balloon. The balloon is filled with helium (He) at a temperature of 305-degrees K and just floats in the air, neither rising nor falling. The density of the surrounding air is 1.19-kg/m^3. Find the absolute pressure of the helium gas