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Q. 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. Determine equilibrium readings of both scales.
Then the driver sees a red light up ahead at next intersection, and starts slowing down at the constant rate. The car stops at the red light, 180 {rm m} from where it was at t = 0.
A person can survive a feet-first impact at the speed of about 12 m/s (27 mi/h) on concrete; 15 m/s (34 mi/h) on soil; and 34 m/s (76 mi/h) on water. Why are there different values for different surfaces.
An adult exerts a horizontal force on a sewing that is suspended by a rope of length L, holding it at an angle x with the vertical. The child in the swing has a weight W and dimensions that are negligible compared to L.
What is the velocity of q_{2} when the balls are 0.450 m apart. what is the speed that the bar falls.
An oscillator with a mass of 420 g and a period of 0.900 s has an amplitude that decreases by 1.90 percent during each complete oscillation.
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.
What minimum constant acceleration does this need if the aircraft is to be airborne after a takeoff run of 250 m.
An ideal spring has the spring constant k = 428 N/m. find the distance this spring must be stretched from its equilibrium position for 28 J of work to be done.
Consider the four masses. Find the total gravitational potential energy of this system. How does your answer to part A change if all the masses in the system are doubled.
A humanitarian aid package is dropped from a plane flying horizontally 500m above the ground with a speed 100m/s. What is the speed of the package at time of impact? (Calculate the total speed, not a horizontal or vertical projection.)
On a cool morning, when the temperature is 14 degrees C, you measure the pressure in your car tires to be 30 psi. After driving 50 mi on the freeway, temperature of your tires is 52 degrees C.
at what distances from the speaker do you hear a minimum sound intensity.
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