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A grasshopper hops along a level road. On each hop, the grasshopper launches itself at angle θ0=45 degree and achieves a range R = 0.82 meter. Find the average horizontal speed of the grasshopper as it hops along the road? Suppose that the time spent on the ground between hops is negligible.
The atomic mass of ammonia is 17 atomic mass units. What is the atomic mass of nitrogen if a molecule of ammonia consists of one atom of nitrogen and three atoms of hydrogen?
A bolt comes loose from the bottom of an elevator thatis moving upward at a speed of 5.42 m/s. The boltreaches the bottom of the elevator shaft in 2.90 s. Howhigh up (in m) was the elevator when the bolt came loose?
The resistance of a bagel toaster is 14 ?. To prepare a bagel, the toaster is operated for one minute from a 120-V outlet. How much energy is delivered to the toaster
A diffraction grating produces a first-order bright fringethat is 0.0824 m away from the centralbright fringe on a flat screen. evaluate the wavelength of the light shining on the grating
In order to clearly read a book 24 cm away, a farsighted girl needs an image to be 35 cm from her eyes. What focal length is necessary for lens in her eyeglasses.
Two trains are traveling toward each other in still air at 27.6 m/s relative to the ground. One train is blowing a whistle at 330 Hz. The speed of sound is 343 m/s.
A total of 8.07·106 electrons are placed on an initially uncharged wire of length 3.77 m. What is the magnitude of the acceleration of a proton placed at that point in space
A contact lens is made of plastic with an index of refraction of 1.36. The lens has an outer radius of curvature of +1.91 cm and an inner radius of curvature of +2.41 cm. What is the focal length of lens?
a projectile is launched vertically from the surface of the moon with an initial speed of 1100m/s. At what altitude is the projectile's speed one-half its initial value
A projectile is fired from ground level over level ground by an initial velocity that has a vertical component of 20 m/s and a horizontal component of 30 m/s. For g = 10m/s^2. The distance from launching to landing point is?
A vector is located in the x-y plane. The x component is 4.00 m and the y component is 3.00 m. Find the angle that this vector makes with the positive y-axis
A soap bubble (with index of refraction 1.33) is floating in air. If the thickness of the bubble wall is 114 nm, what is the wavelength of the visible light that is most strongly reflected
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