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Q. A 60 kg person drops from rest a distance of 1.20m to a platform of negligible mass supported by a stiff spring. The platform drops 6cm before the person comes to rest. What is the spring constant of the spring?
1. 3.45 × 10^4 N/m 2. 8.83 × 10^4 N/m 3. 2.56 × 10^5 N/m 4. 4.12 × 10^5 N/m 5. 3.92 × 10^5 N/m
Suppose that 0.10mol of argon gas is admitted to an evacuated 50cm3 container at 20° C. The gas then undergoes isobaric heating to the temperature of 300°C. What is the final pressure of gas? What is the final volume.
A professor's office door is 0.9 wide, 2.0 high, and 4 thick; has a mass of 25; and pivots on frictionless hinges. A "door closer" is attached to door and top of the door frame.
A space probe on the surface of Mars sends a radio signal back to the Earth, a distance of 8.48 x10^7 km. Radio waves travel at the speed of light (3.00 x10^8 m/s). How many seconds does it take for the signal to reach the Earth.
A professor's office door is 0.94 wide, 2.2 high, 4.0 thick; has the mass of 23, and pivots on frictionless hinges. A "door closer" is attached to door and top of the door frame. When the door is open and at rest, the door closer exerts a torque of 5..
Find tension in the back muscle and the compressional force
The cable pulls horizontally on the box, and a 50.30 bag of gravel rests on top of the box. The coefficients of friction between the box and roof are shown. The system is not moving. Find out the friction force on the bag of gravel.
How numerous revolutionsthe wheel have made through the time
A coin rests 14.60 cm from the center of turntable. The coefficient of static friction between the coin and turntable surface is 0.350. The turntable starts from rest at t = 0 and rotates with the constant angular acceleration of 0.8400 rad/s2.
A force F = 200i - 400j + FZ k N, is acting through point A(0,0,0) m.
On December 3 at 11 pm you look toward the eastern horizon and see the bright star Procyon rising. At approximately what time would Procyon rise one week later, on December 9.
Two pipes of equal length are each open at one end. Each has the fundamental frequency of 500 Hz at 325 K. In one pipe the air temperature is increased to 330 K. If the two pipes are sounded together, what beat frequency results.
An insulated Thermos contains 145 cm3 of hot coffee at 89.0 °C. You put in an 11.0 g ice cube at its melting point to cool the coffee. By how many degrees (in Celsius) has your coffee cooled once the ice has melted and equilibrium is reached? Treat c..
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