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A delivery truck hits a parked car from behind. The mass of the car is 2550 kg. What force is exerted on the car if (a) the car is rigid and accelerates to 4.5 m/s in 0.2 s? (b) the car has crumple zones and accelerates to 4.5 m/s in 0.30 s?
water flows at a rate of 200 liters per second up through a conical vertical pipe. the diameter at the bottom is 240 mm and at the top is 200 mm and the length is 5 m. the pressure at the bottom is 8 bar and the pressure at the top is 7.3 bar. determine.
1.- the loss of load through the pipe
2.-express it only as a function of the existing velocity head
A student driver steps on the gas to increase her speed from 11 m/s to 15 m/s in 30s. Find her acceleration
A bead sliding on a wire has a speed of 210 cm/s at A. If friction forces are negligible, what will
be the speed at pt. B and C?
a body having a specific gravity of 0.7 floats on a liquid of specific gravity 0.8. the volume of the body above the liquid surface in what percent of its total volume
Two electrons approaches each other with equal speeds 0.9c. Find the speed of one electron w.r.t. the other.
A pion moving with speed 0.6c emits a muon in the same direction. Speed of muon in the rest frame of pion is
0.4c. calculate the speed of muon in lab frame.
A ball of mass m is suspended from a rope of length l and at rest is a height h above the ground. The ball is pulled back to an angle of θ 1 and released. When the rope makes an angle of θ 2 and the ball is on its way up, the string breaks. Given where the ball lands with respect to its rest position, determine the height h the ball is above the ground when in the rest position.
m =5.0 kg
θ 1 = 80°
θ 2 = 50°
l = 1.5 m
Δdx = 3.5 m
Vector A has magnitude 4 units, vector B has magnitude 6 units. The angle between A and B is 60 degrees. Calculate the magnitude of 2A + 3B.
Define the concept normal force
