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Two railroad cars, each og mass 6500-kg and traveling 95 km/h,collide head-on and come to rest. How much thermal engery is produced on the collision?
A sphere of radius r =34.5 cm and massm = 1.80 kg starts from rest and rolls without slipping down a 30.0? incline that is 10.0 m long. Calculate its translational speed when it reaches the bottom
A tree is approximated as a 60m tall cylinder with a diameter of 3m. What is the weight of the tree, using p as the unknown density of wood? Calculate the amount of compression of the tree due to gravity.
an elephant has legs that stretch 2.3 from its shoulders to the ground. how much time is required for one leg to swing
Identical point charges of +3.6 ?C are fixed to diagonally opposite corners of a square. Find the sign and magnitude of the third charge
What is the effective spring constant (that is, the ratio of force to change in length) of a copper cable that is 7.0 in diameter and 13 long?
A softball having a mass of 0.255 kg is pitched at 92.3 km/hr. By the time it reaches the plate, estimate the average force of air resistance during a pitch
Calculate the diameter of a 1.51 cm long tungsten filament in a lightbulb if its resistance is 0.507 ?
A steel cable with total length 30 m and mass 100 kg is connected to two poles. find the wavelength of the resulting wave on the cable
the potential at location a is 419 v. a positively charged particle is released there from rest and arrives at location
question1a spherical mirror is polished on both sides. when concave side is used as a mirror the magnification is 2.0.
A rock is tossed straight up with a speed of 29 m/s. How long is the rock in the air, from the instant it is released until it hits the bottom of the hole
A lens has diameter of 30 mm, What is the lens' theoretical resolution limit (in nm) when it is used in air with light of 550-nm wavelength
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