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A 1500 kg automobile travels at a speed of 80 km/h along a straight concrete highway. Faced with an emergency situation, the driver jams on the brakes, and the car skids to a stop.
The person in the middle weighs 270 N, and the tensions in each rope are 200 N. What is the weight of the staging?
A galvanometer has a full-scale current of 0.100 mA and a coil resistance of 50.0 . This instrument is used with a shunt resistor to form an ammeter that will register full scale for a current of 60
A double-slit experiment is set up using red light (l = 709 nm). A first order bright fringe is seen at a given location on a screen. What wavelength of visible light (between 380 nm and 750 nm) wo
A man doing push-ups pauses in the position shown in the figure. His mass = 71 . A) Determine the normal force exerted by the floor on each hand.
Perform a Linear Regression Fit of Weight versus Displacement. Make a plot with your measured values and a best-fit line. Obtain the spring constant k and the uncertainty
A river flows due east at 1.43 m/s. A boat crosses the river from the south shore to the north shore by maintaining a constant velocity of 10.5 m/s due north relative to the water.
An automobile traveling along a straight road increases its speed from 18 ft/s to 33 ft/s in 180 ft. If the acceleration is constant, how much time elapses while the auto moves the 180 ft?
A particle leaves the origin with an initial velocity of 5.00 m/s in the x direction, and moves with constant acceleration ax = -2.20 m/s2 and ay = 5.00 m/s2. What is the particle's velocity at this
Unpolarized light with intensity of 30 W/m2 passes through two polarizers in turn with polarization axes at 300 to each other. What is the intensity of the final transmitted light?
A stone with a mass of 0.700 {rm kg} is attached to one end of a string 0.900 {rm m} long. The string will break if its tension exceeds 50.0 {rm N}. The stone is whirled in a horizontal circle on a
What would happen to the protection capabilities of a fuse wire if it were made from a larger diameter wire? D. Best grade level?
A 1500-kW heat engine operates at 25% efficiency. The heat energy expelled at the low temperature is absorbed by a stream of water that enters the cooling coils at 20 degrees C. If 60 L flows across
The useful energy released in the fission of a 235 U nucleus is about 200 MeV. What does the 235 refer to? How many uranium nuclei undergo fission each second in a 1000 MW power reactor?
A projectile returns to its original height after 4.08 seconds, during which time it travels 76.2 meters horizontally. If air resistance can be neglected, what was the projectile's initial speed?
A rigid tank contains 1.30 moles of an ideal gas. Determine the number of moles of gas that must be withdrawn from the tank to lower the pressure of the gas from 24.5 atm to 4.40 atm. Assume the vol
What are the wavelengths for the fundamental frequencies of the two types of tubes? The wavelength is 4L when the tube is closed and the open tube the wavelength is 2L.
The atmospheric pressure at sea level is about 1.0 multiplied by 105 Pa. What is the force at sea level that air exerts on the top of a typical office desk, 159 cm long and 86 cm wide?
A 4.5 kg block located on a horizontal frictionless floor is pulled by a cord that exerts a force F=13.50 N at an angle theta=30.0 degrees above the horizontal. What is the speed of the block 5.50 s
Which of the following forces should be included in a freebody diagram for the car? A. a normal force that points vertically upward B. a normal force that points at an angle
Determine the components of the hiker's total displacement for the trip. Find the magnitude and direction of the displacement from base camp.
A new experiment is created with the screen at a distance of 1.9 m from the slits (with spacing 0.1 mm). What is the distance between the second order bright fringe of light with l = 697 nm and the
A stunt man whose mass is 70 kg swings from the end of a 4.4 m long rope along the arc of a vertical circle. Assuming that he starts from rest when the rope is horizontal, find the tensions in the r
An object whose density is 900kg/m3 is placed in water. Describe what will happen to this object when placed in water.
If I used the same B field strength as the guiding (bending) magnets in LEP, what would be the diameter of this electron accelerator? Does that sound ridiculous?