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Two horizontal forces, 231 N and 190. N, are exerted in opposite directions on a crate. What is the net horizontal force on the create? Be sure to indicate the direction of the net force. (Assume t
A weather balloon rises through the atmosphere, its volume expanding from 5.0 to 14 as the temperature drops from 23 to -7. If the initial gas pressure inside the balloon is 1.0 atm, what is the fi
A container of hot water at 80 degrees Celsius cools to 79 degrees Celsius in 15 seconds when it is placed in a 20 degrees Celsius room. Use Newton's law of cooling to estimate the time it will tak
A block of mass m = 2.0 kg is dropped from height h = 55 cm onto a spring of spring constant k = 1960 N/m (Fig. 8-36). Find the maximum distance the spring is compressed.
A DC voltage source with voltage V and output resistance (i.e., internal resistance)R0 is connected to a load of resistance RL, which may be varied. Show that the power dissipated in the load will
You want to shoot a stone with a slingshot and hit a target on the ground 14.6 m away. If you give the stone an initial velocity of 12.5 m/s, neglecting friction, what must be the launch angle in or
The amount of internal energy needed to raise the temperature of a quantity of liquid is 555.3J. How fast must a 0.24 kg baseball travel in order for its kinetic energy to equal this internal energ
A diffraction grating has a grating spacing of 2,104 nm. If a light ray of a wavelength 480 nm is incident perpendicularly upon the grating, what angle (in degrees) will you see the first order diff
When the cable holding the elevator blew up, suppose the mass of the elevator and passengers were 150kg, and the frictional force (wheels on tracks) was 9000N. What is the acceleration of the elevat
A car of mass 2500 kg collides with a truck of mass 4500 kg, and just after the collision the car and truck slide along, stuck together. The car's velocity just before the collision was < 39, 0,
A 9.40 kg projectile is fired vertically upward. Air drag decreases the mechanical energy of the projectile-Earth system by 69.5 kJ during the projectile's ascent. How much higher would the project
A submarine dives 120.0 m at an angle of 12.0 below the horizontal. What are the horizontal and vertical components of the submarine's displacement?
A wooden rod of negligible mass and length 82.0 is pivoted about a horizontal axis through its center. A white rat with mass 0.470 clings to one end of the stick, and a mouse with mass 0.200 clings
The top two charges have +1.5nC, the bottom two charges have -1.5nC. What is the magnitude and direction of the net electric field at the exact center of the square?
A projectile is fired at an angle of 45 degree with initial kinetic energy E. At the top of its trajectory, the projectile exploes with additional energy E into two fragments. One fragment of mass m
Strikes the surface of an opposite plate 1.60cm distant from the first 1.5 x 10^-6 s later. A uniform electric field exists between the two plates, what is its magnitude?
What is the angular separation of two spectral lines of wavelengths 417 nm and 388 nm formed in order m=2 with a 456 line/mm grating?
The sport with the fatest moving ball is jai alai, where measured speeds have reached 303km/h. If a professinal jai alai player faces a ball at that speed and involuntarily blinks, he blacks out th
A small object with a mass of 410 mg carries a charge of 35.0 nC and is suspended by a thread between the vertical plates of a parallel-plate capacitor. The plates are separated by 3.00 cm. If the
What is seismic tomography? how it is done in practice?
On level ground a shell is fired with an initial velocity of 88.8 at 53.8 above the horizontal and feels no appreciable air resistance. Find the horizontal and vertical components of the shell's ini
A jogger runs 100 m due east, then changes direction for the second leg of the run. At the end of the run, she is 350 m away from the starting point at an angle of 25.0° north of east. What wer
If the blocks move determine the magnitude of their acceleration. If the blocks move determine the magnitude of the tension in the string. If the blocks do not move determine the sum of the magnitud
A 7 omega resistor is mounted in parallel with a resistor R=8 omega, and this combination is connected in series with an 6 omega resistor and a 12 Volts battery. What is the current through the R re
A beaver is pulling a small branch of mass m up a hill at a constant velocity. The hill slope is at an angle θ above the horizontal. The coefficient of friction is μk. State how much force