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A 40-N stone is dropped from a height of 10m and strikes theground with a velocity of 7 m/s. What average force of air frictionacts on it as it falls.
In an experiment in physics class, a model solid-fueled rocket is fired vertically with an acceleration of 3 m/sec2 for 6 seconds. After that time, What is the maximum altitude the rocket reaches
Given two vectors A? = 4.00 i^+ 7.80 j^ and B? = 5.60 i^? 2.00 j^ , find the scalar product of the two vectors A? and B?. Find the angle between these two vectors
These coils have a radius R = 33 cm. The distance between the coils is, of course, also d = 33 cm (otherwise they would not form a Helmholtz system). Each coil has 72 turns. As explained above, we will not measure the current but rather the voltag..
A 3.1 kg bundle starts up a 30° incline with 178 J of kinetic energy. How far will it slide up the incline if the coefficient of kinetic friction between bundle and incline is 0.30
A 32cm string being held at a tension of 64.5N has a fundamental frequency of 440Hz. What are the second and third harmonics of the string
Westerly winds coming off the Pacific Ocean rise over the Rocky Mountains, which rise to a height of approximately 15,000 ft (580 hPa). The air on the western side of the mountain range is at 800 hPa (T = 70 F, r = 0.75), and will subside on the e..
A particle moves along the x axis. It is initially at the position 0.330 m, moving with velocity 0.250 m/s and acceleration -0.280 m/s2. Find its velocity at the end of this time interval
What is the speed of the electron when it strikes the target? How far does it fall under the influence of gravity during its flight?
A 17 kg girl slides down a playground slide that is 3.1 m high. When she reaches the bottom of the slide, her speed is 1.3 m/s. what is the coefficient of friction between the girl and the slide
A child playing in a swimming pool realizes that it is easy to push a small inflated ball under the surface of the water while a large ball requires alot of force. calculate the diameter of the ball
Baseball scouts often use a radar gun to measure the speed of a pitch, What will be the increase in frequency if these waves are reflected from a 60.0mi/h fastball headed straight toward the gun
There is evidence that elephants communicate via infrasound, generating rumbling vocalizations as low as 14 Hz that can travel up to 10 km. The intensity level of these sounds can reach103dB, measured a distance of4.5m from the source. Determine the ..
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