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A car is driving directly north on the freeway at a speed of 114 km/h and a truck is leaving the freeway driving 92 km/h in a direction that is 30° west of north. What is the velocity of the truck relative to the car? Magnitude? Direction ?
Some amusement park rides move you back and forth in the horizontal direction. Why is this motion so much more disturbing to your body than cruising at a high speed in a jet airplane.
A blacksmith drops a 500 g iron horseshoe into a bucket containing 25 kg of water. what is the equilibrium temperature of the system
When light is incident on a surface the critical angle is 40.0 degrees. The two materials are air and glass. What is the polarization angle for this light
The jet accelerates uniformly, and during that time, the pendulum oscillates about the equilibrium position shown by the solid line, with D = 0.370 m. find the magnitude of the plane's acceleration.
the specific heat of aluminum is .215 calories per gram per degree celcius. calculate the amount of heath required to raise the temperature
A monatomic ideal gas at high temperature T in a discharge tube has a triply degenerate excited state at an energy e above the ground state, Find the ratio population of the excited state to that of the ground state
What is the size of the smallest vertical plane mirror in which a 10 tall giraffe standing erect can see her full-length image? (Hint: Locate the image by drawing a number of rays from giraffe's body that reflect off the mirror and go to her eye.
A 200 km long high-voltage transmission line 2 cm in diameter carries a steady current of 1050 A. If the conductor is copper with a free charge density of 8.8 x10^28 electrons per cubic meter, how various years does it take one electron to travel ..
A 65.0 kg object slides down a 30o angle slope from rest at a height of 15.0 m. The coefficient of kinetic friction between the object and the slope surface is 0.15. What is the object's speed at the bottom of the slope
We pass a laser beam through a double slit. On a screen 18.52 m away, we observe a series of bright lines which are 3.4 mm apart. What is the distance between the two slits
A light ray is incident upon a plane interface between two materials. The ray makes an incident angle with the normal to the surface of 39 degrees in a material, find thev refracted angle (in degrees) in that material
A 5?, 10?, and 20? resistor are connected in parallel and the combination connected in parallel to a 20V battery with negligible resistance
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