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An ideal spring of negligible mass is 11.00 long when nothing is attached to it. When you hang a 3.20- weight from it, you measure its length to be 12.30 . If you wanted to store 10.0 of potential
A particle moves with constant acceleration a. The expression v_{rm i}+at represents the particle's velocity at what instant in time?
A jetliner is moving at a speed of 380 m/s. The vertical component of the plane's velocity is 46.8 m/s. Determine the magnitude of the horizontal component of the plane's velocity
A uniform meterstick pivoted at its center has a 100-gram mass suspended at the 25.0 cm position. (a) At what position should a 75.0 gram mass be suspended to put the system in equilibrium? (b) What
Two perpendicular sides of a triangle are 5.51 m and 7.65 m long, respectively. Find the length of the third side of the triangle.
A 115 kg fullback runs at the line of scrimmage. (a) Find the constant force that must be exerted on him to bring him to rest in a distance of 1.2 m in a time interval of 0.20 s. Opposite the fullb
As a loop of wire with resistance of 10 ohm moves in a constant non-uniform magnetic field, it loses kinetic energy at a uniform rate of 4.0 mJ/s. what is the induced current in the loop ?
a uniformly accelerating train passes a green light signal atk mhr it passes a second light 125m farther down the track 0s later what is the trains acceleration? What is the trains velocity at the s
One mole of an ideal gas is heated so that T = AP2, where A is a constant and P is the pressure. The temperature changes from T0 to 4T0. Find the work done by the gas. (Use the following as necessa
(Assume that the Sun's luminosity remains nearly constant during the entire 1.2×1010 years.) What fraction does this represent of the total mass of hydrogen that was originally in the Sun?
A football player runs directly down the field for 39 mbefore turning to the right at an angle of 23 from his original direction and running an additional 10 m before being tackled.
Two uncharged metal spheres, spaced 15cm apart, have a capacitance of 24pF. How much work would it take to move 12nC of charge from one sphere to the other?
3.23 If an experimenter is able to measure the location of an atom's electron to a precision of 0.06 nm, what is the uncertainty in the velocity of the electron?
an 88 grams arrow is fired from a bow whose string exerts an average force of 100 N on the arrow over a distance of 78 cm. What is the speed of the arrow as it leaves the bow in m/s?
An elastic cord is 63 cm long when a weight of 57 N hangs from it but is 89 cm long when a weight of 83 N hangs from it. What is the "spring" constant k of this elastic cord?
A 10-cm-long thin glass rod is uniformly charged to +50 nC. A small plastic bead, charged to - 4.8 nC, is 4.2 cm from the center of the rod. What is the magnitude of the force of the bead?
What is the gravitational attraction between two pith balls? [electrostatic and coulomb's law]
Kieran takes off down a 50 m high, 10° slope on his jet-powered skis. The skis have a thrust of 320 N. The combined mass of skis and Kieran is 50 kg (the fuel mass is negligible). Kieran's speed
A uniform rod of weight W and length l is suspended from a pivot at a point on the ceiling. The lower end rests on a thin sheet of paper spread on the floor.
A cosmic-ray proton in interstellar space has an energy of 19.5 MeV and executes a circular orbit having a radius equal to that of Mercury's orbit around the Sun (5.80 1010 m). What is the magnetic
A truck emits sound with a frequency of 620 Hz. A person is riding a bike that moves at a speed of 3.0 m/s and is following the truck. If the person hears a frequency of 560 Hz, how fast is the truc
A worker pushes horizontally on a large crate with a force of 304 N, and the crate is moved 4.4 m. How much work was done?
A 84 kg diver steps off a 15 m tower and drops from rest straight down into the water. If he comes to rest 4.2 m beneath the surface, determine the average resistance force exerted on him by the wat
A trapeze artist swings in simple harmonic motion with a period of 3.2 s. The acceleration of gravity is 9.81 m/s2. Calculate the length of the cables supporting the trapeze.
The mass flow rate is 1.25 kg/s. Using the ideal gas model, and neglecting potential energy effects, determine the exit area. Take cp,He to be 5.193 kJ/kg·K. Answer in m².