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A helocopter is moving vertically up with a velocity of 8m/s. a packet is dropped from the window of the helicopter at a height of 122.8 m from ground. how long the packet will take to reach the ground?
A drug prepared for a patient is tagged with 9943Tc which has a half-life of 6.05 h. What is its activity at the time it is injected
When a uniform electric field directed horizontally (from left to right) is introduced, equilibrium is eventually established with the mass hanging at an angle
What is the angular speed of a rotating wheel that has a moment of inertia of 0.330 kg.m^2 and a rotational kinetic energy of 2.75J
A speedboat starts from rest and accelerates at +2.15m/s2 for 8.35 s. At the end of this time, the boatcontinues for an additional 8.62 s with an acceleration of +0.629m/s2. Following this, the boat accelerates at -0.968m/s2 for 8.87 s.
A golfer hits a golf ball of mass 0.045kg the ball over some short trees. he hits the ball at an angle of 60 degreed to the horizontal, What is the change in momentum of the golf club
A small bag of sand is released from an ascending hot-air balloon whose upward constant velocity is v0 = 1.55 m/s. determine the time it takes the bag to reach the ground
An engineer wishes to determine the specific heat of a new metal alloy. A 0.150-kg sample of the alloy is heated to 540°C. Calculate the specific heat of the alloy
The speed of a particle moving in a circle 2.0 m in radius increases at the constant rate of 4.4 m/s2. what is the speed of the particle
The speed of sound in bone is 3500 m/s. How much time does it take the echo of a sound wave to travel from the back of the bone to the front of the bone if the bone is 2.50 cm thick.
A conical pendulum is formed by attaching a 0.90kg ball to a 1.0m -long string, What is the ball's angular velocity, in rpm
One common kind of computer keyboard is based on the idea of capacitance. Each key is mounted on one end of a plunger, find the change in capacitance that is detected by the computer
A 150-V battery is connected across two parallel metal plates of area 28.5 cm2 and a separation of 8.20 mm. A beam of alpha particles (charge +2e, mass 6.64E-27 kg) is accelerated from rest through a potential difference of 1.75 kV and enters the reg..
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