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Two children pull on a toy truck of mass 2.4 kg along a rough horizontal surface. One child pulls with a force of 8.4 N and the other pulls with a force of 3.6 N in the opposite direction. The coefficient of friction is 0.18. Find the acceleration of the truck.
An airplane with a speed of 74.9 m/s is climbing upward at an angle of 38.3 ° with respect to the horizontal. When the plane's altitude is 631 m, Calculate the distance along the ground
A set of crash tests consists of running a test car, moving at a speed of 12.8 m/s, into a solid wall. Calculate the size of the average force which acts on the dummy
Mary needs to row her boat across a 180m -wide river that is flowing to the east at a speed of 1.3m/s . Mary can row with a speed of 2.6m/s. What is her speed with respect to the shore
a popgun uses an ideal spring for which k=2000N/m. how high can the gun shoot a 5.0gram projectile
a dart is thrown horizontally with an initial speed of 17 ms toward point p the bulls-eye on a dart board. it hits at
Two hydrogen atoms collide head on. The collision brings both atoms to a halt. Immediately after the collision, both atoms emit a 121.6 nm photon. What was the speed of each atom just before the collision?
A molecule of DNA (deoxyribonucleic acid) is 2.07 µm long. The ends of the molecule become singly ionized: negative on one end, Determine the effective spring constant of the molecule
Two resistors (connected in series with each other) and a 18 Vbattery are connected in a loop. The voltage drop across the firstresistor is 7 V. What is the voltage drop across the secondresistor?
A thin glass rod is submerged in oil. What is the critical angle for light traveling inside the rod
Atmospheric air blows in toward the shore at a beach in Florida. It is assumed that a boundary layer begins to develop about 12 km from shore. If the wind speed averages 18 m=s, estimate the thickness of the boundary layer and the shear stress on ..
Communications satellites are used to bounce radio waves from the earth's surface to send messages around the curvature of the earth. In order to be available all the time, they must remain above the same point on the earth's surface and must move..
q1. a meterstick is at rest in an inertial frame s2. if s2 moves with a speed of 0.7c with respect to a rest frame s1
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