A wooden block of mass = 500 is pressed against a spring of force constant = 1200 / and is held at rest at point , as shown in the figure. The compression in the spring is = 10 . When released, the block moves on a frictionless surface and climbs up a ramp of height ℎ = 80 . a) Find the speed of the block when it reaches to the top of the ramp at point . () When the block reaches the edge of the ramp, it leaves the ramp horizontally and undergoes a free-fall. b) Find the time of flight. c) Find the horizontal distance from the edge of the ramp where the block hits the ground. d) Find the speed of the block just before it hits the ground.

For problems 1-3, consider a simple dc brush motor with a permanent magnet stator. with an an consider a simple dc brush motor with a permanent magnet ae supply voltage of 100 v, the no-load speed of the motor is 1000 rpm. this motor can provide a torque of 1.9 n-m at 800 rpm drawing a current of 2 a current are both zero at no load.) 1. with an armature supply voltage of 100 v, the motor is operated at 900 rpm. what is the motor torque? what is the mechanical power delivered by the motor? what is the current draw? what is the electrical power input? what is the energy efficiency of the motor? with an armature supply voltage of 100 v, the motor is operated at 1100 rpm (where it acts as a generator). what torque input is required? what mechanical power is required what current is generated? what is the electrical power generated? what is the energy efficiency of the motor acting as a generator? 2. with an armature supply voltage raised to 120 v, the motor is operated at 1000 rpm. what is the no-load speed? what is the motor torque? what is the mechanical power delivered by the motor? what is the current draw? what is the electrical power input what is the energy efficiency of the motor? 3.

Which transition by an electron will release the greatest amount of energy? oa ob oc od

What is the thinnest soap film (excluding the case of zero thickness) that appears black when illuminated with light with a wavelength of 480 ? the index of refraction of the film is 1.34, and there is air on both sides of the film. express your answer in nanometers. hint 1. how to approach th