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Q. A potential difference of 90 mV exists between the inner surfaces of a cell membrane. The inner surface is negative relative to the other surface. How much work is required to eject a positive sodium ion (Na+) form the interior of the cell?
Q. A student (m=75 kg) falls freely from rest and strikes the ground. During the collision with the ground, he comes to rest in a time of 0.040 seconds. The average force exerted on him by the ground is +18000 N, where the upward direction is taken to be the positive direction. From what height did the student fall? Assume that the only force acting during the collision is that due to the ground.
What least heat is needed to bring 80 of water at 20 to the boiling point and completely boil it away? (answere in Joules).
Find the force exerted by the plane on the pilot
A light source, S, is located 2.60m below the surface of a swimming pool and 1.30m from one edge of the pool. The pool is filled to the top with water.
What hormones are hypersecreted causing hyperglycemia and hypertension? What is the cause and what physical factor allow to rule out thyroid problem.
What are the forces acting on the board due to the two supports as a diver of mass 63 kg stands at the end of the board over the water.
Two crates, of mass 75.0 kg and 109 kg, are in contact and at rest on a horizontal surface. A 732 N force is exerted on the 75.0 kg crate. What is the force the each crate exerts on the other.
A car accelerates from rest to a kinetic energy of 1.65 x 10^5 Joules in a distance of 646 m. How much force did the car's engine deliver to produce the change in kinetic energy.
A super tanker with the mass of 3.36 × 109 kg is moving with a constant velocity. Its engines generate a forward thrust of 4.11 × 105 N. Determine (a) magnitude of the resistive force exerted on the tanker by the water and (b) magnitude of the upward..
What is the turntable rotation angular velocity
A certain medical machine emits x-rays with a minimum wavelength of 0.025 nm. One day, the machine has an electrical problem and the voltage applied to the x-ray tube decreases to 80 percent of its normal value. Now what is the minimum x-ray wavel..
A high-speed drill reaches 2000 rpm in 0.50 s. What is the drill's angular acceleration? Through how many revolutions does it turn during this first 0.50s.
Determine an average acceleration in coordinates with x-axis
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