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Q. The pulley of an ideal Atwood's machine is given an upward acceleration a, as shown below. Find the acceleration of each mass and the tension in the string that connects them. Take the accelerations to be positive if they are pointing up. The speeds of the two blocks are not equal in this situation. (Use the following as necessary: a, m1, m2, and g for the acceleration due to gravity.)
Q. You normally drive on the freeway between San Diego and Los Angeles at an average speed of 87 km/h (54 mi/h), and the trip takes 2 h and 49 min. On a Friday afternoon, however, heavy traffic slows you down and you drive the same distance at an average speed of only 44 km/h (27 mi/h). How much longer does the trip take?
A 70kg man walks out on a 10kg beam that rests on, but is not attached to, two supports. When beam just starts to tip, what is the force exerted on the beam by the right support.
A person exerts a horizontal force of F = 169N in the test apparatus. (h = 0.32m.) Find the horizontal force M that his flexor muscle exerts on his fore arm.
Plane leaves the airport in Galisto and flies a distance 180 at an angle 68 east of north and then changes direction to fly the distance 250 at an angle 48 south of east, after which it makes an immediate emergency landing in a pasture.
A river has a steady speed of 0.42m/s. A student swims upstream a distance of 1 km and swims back to the starting point. If the student can swim at a speed of 1.25 m/s in still water, how long does the trip take.
find What is the impulse delivered by the bat.
What is the frequency of light that has the wavelength in water of 788 nm if the refractive index for this light is 1.33.
Assume that Newton's law of universal gravitation can be applied to these two students and find the gravitational force (in Newtons) that one student exerts on the other when they are separated by 0.493 m. Consider entering the answer using scient..
Sunlight is used in a double-slit interference experiment. The fourth-order maximum for the wavelength of 470 nm occurs at an angle of θ = 90°. Thus, it is on the verge of being eliminated from the pattern since θ cannot exceed 90°.
Consider the conical pendulum with an 80.0 kg bob on a 10.0 m wire making an angle of 5.00 with the vertical as shown. Determine (a) horizontal and vertical components of the force exerted by the wire on the pendulum and (b) radial acceleration of th..
Consider a system composed of a mixture of 2.50kg of ice and 50 gr of liquid water and a small separate container of finely powdered salt. This physical system is contained in a fully insulated container that prevent.
find static friction between the chair and the floor.
As part of a safety investigation, two 1900 cars traveling at 23 are crashed into different barriers. Find the average forces exerted on (a) car that hits a line of water barrels and takes 1.5 to stop, and (b) car that hits a concrete barrier and ta..
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