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Suppose you are 81 cm from a plane mirror. What area of the mirror is used to reflect the rays entering one eye from a point on the tip of your nose if your pupil diameter is 4.8 mm
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A mass of 0.53 kg attached to a vertical spring stretches the spring 37 cm from its original equilibrium position. The acceleration of gravity is 9.81 m/s2 . What is the spring constant? Answer in units of N/m.
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A dog pulls on a pillow with a force of 27 N at an angle of 34 above the horizontal. Find the x and y components of this force
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The free-fall acceleration on the moon is 1.62 . What is the length of a pendulum whose period on the moon matches the period of a 1.60-m-long pendulum on the earth?
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a metal container in the shape of a sphere which is .2 meters in diameter contains 16 grams of oxygen at 6.5 atm of pressure. what is the temperature inside the box
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what law of motion is a swimmer in the water pushes off the wall and glides off in the opposite direction?
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An object is projected upward from the sur- face of the earth with an initial speed of 5 km/s. The acceleration of gravity is 9.81 m/s2. Find the maximum height it reaches. Answer in units of km.
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An experiment measures the temperature of a 270 substance while steadily supplying heat to it. The figure shows the results of the experiment. What are (a) the specific heat of the liquid phase and (b) the heat of vaporization?
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Relative to the ground, what is the gravitational potential energy of a 59.0-kg person who is at the top of the Sears Tower, a height of 443 m above the ground?
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What is the sound intensity of a whisper at a distance of 1.5 {\rm m}, in {\rm{ W/m}}^{\rm{2}} ?
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Sample Questions
- 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
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