Start Discovering Solved Questions and Your Course Assignments
TextBooks Included
Active Tutors
Asked Questions
Answered Questions
Determine the magnitudes of the tension force t in the deltoid muscle and the force s of the shoulder on the humerus (upper-arm bone) to hold the arm in the position shown.
A student (m = 56 kg) falls freely from rest and strikes the ground. During the collision with the ground, he comes to rest in a time of 0.04 s. The average force exerted on him by the ground is +18
What is the index of refraction of a material in which the speed of light is 1.21 x 10^8 m/s?
A person shines a light at a friend who is swimming under water. If the ray in the water makes an angle of 34.2degrees with the normal, what is the angle of incidence? Answer in degrees
Some time later the proton is at a point where the potential is 192 V. If no force other than the electrostatic force acts on the proton, what is its final kinetic energy?
A firefighter of mass 135 kg slides down a vertical pole with an acceleration of 4 m/s2. What is the friction force that acts on the firefighter?
The incoming ray makes an angle of 26.1degree with the normal, and the refracted ray makes an angle of 20.2degree with the normal. Find the index of refraction of the transparent material. (assume t
A 1.97 kg ball is attached to the bottom end of a length of fishline with a breaking strength of 11 lb (49.0 N). The top end of the fishing line is held stationary. The ball is released from rest wi
A curve with a 140 m radius on a level road is banked at the correct angle for a speed of 20 m/s. If an automobile rounds this curve at 30 m/s, what is the minimum coefficient of static friction b
The position of a 900 kg boulder's center of mass has been determined to within an uncertainty of 1.0 nm. (a) What is the minimum uncertainty in the boulder's velocity?
The heat energy contained in coal is approximately 25 MJ/kg. How long would the Sun shine, if it really were a piece of burning coal?
Using the full quantum mechanical model of the hydrogen atom a.) what is the average distance of an electron (in the 3p state)
For this rough path, the coefficient of friction is μk = 0.45. Instead, the spring is only compressed a distance x2 = 0.113 m before being released. How far into the rough path does the block sl
The position of a toy locomotive moving on a straight track along the x axis is given by the equation x = t^3 - 6t^2 + 9t, where x is in meters and t is in seconds. The net force on the locomotive i
When the rock is totally immersed in an unknown liquid, the tension is 18.6N. What is the density of the unknown liquid?
A wrecking ball (weight = 4400 N) is supported by a boom, which may be assumed to be uniform and has a weight of 3000 N. As the drawing shows, a support cable runs from the top of the boom to the t
A 1.00-kg beaker containing 1.80 kg of oil (density = 916 kg/m3) rests on a scale. A 1.90-kg block of iron is suspended from a spring scale and is completely submerged in the oil (see figure below).
A 86 kg water skier floating in a lake is pulled from rest to a speed of 14 m/s in a distance of 25 m. What is the net force exerted on the skier, assuming his acceleration is constant?
Permanent deformation occurs if the stress in the steel exceeds its elastic limit of 3.00 108 N/m2. At what temperature would the wire reach its elastic limit?
The string breaks and the ball lands 2.30 m (horizontally) away from the point on the ground directly beneath the ball's location when the string breaks. Find the radial acceleration of the ball dur
Then construction work forces you to slow to 55 km/h for 40 km. What would be the least speed needed for the rest of the trip to arrive in time for the interview?
A 2000 kg car is traveling at a velocity of 30 m/s when suddenly a deer runs in front of it. Stomping on your breaks the car stops 60 m from its original location. What was the kinetic force of fric
Each speaker produces a tone with a frequency of 200 Hz on a day when the speed of sound is 330 m/s. The person is 1.65 m from one speaker and 4.95 m from the other. What type of interference does t
A 2200 kg suv traveling at 94 km/h can be stopped in 0.21 seconds if it hits a concrete wall. the velocity of the person equals that of the car both before and after the crash, and the velocity cha
sand dunes on a desert island move as sand is swept up the windward side to settle in the leeward side. Such walking dunes have been known to travel 20 feet in a year and can travel as much as 100 f