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Q1. The speed of sound is 340. Find out the speed of sound in air at 0° Calices (320 Fahrenheit) measured in meters per seconds (m/s).
Q2. A professor's office door is 0.95 {rm m} wide, 2.0 {rm m} high, and 4.0 {rm cm} thick; has a mass of 25 {rm kg}; and pivots on frictionless hinges. A "door closer" is attached to the door and the top of the door frame.When the door is open and at rest, the door closer exerts a torque of 4.8 {rm N} cdot {rm m}. What is the least force that you need to apply to the door to hold it open?
Calculate the power required by an object to lift another object
The 3.3 kg piece of wood slides on the surface. The curved sides are perfectly smooth, but the rough horizontal bottom is 35 m long and has the kinetic friction coefficient of 0.24 with the wood. The piece of wood starts from rest 6.0 m above the rou..
What is the minimum rate of rotation, in revolutions per minute, required for the spheres to contact the cylinder wall?
A car dealer claims that his product will accelerate at a constant rate from rest to a speed of 200 km/hr in 8s. What estimated distance will the car travel.
A large power plant converts 1000 kg of water to steam every second to run its generators. Compute the amount of heat required each second just to vaporize the water, assuming this is done at 100 C. What is the power input in megawatts for this pu..
The tape is now wound back into the drum at angular rate. With what speed would the end of the tape move? (Note that our drawing specifies that a positive derivative of implies motion away from the drum. Be careful with your signs. The fact that the ..
A soccer ball with a mass of 448g bounces off the crossbar of a goal and is deflected upward at an angle of 56.2° with respect to horizontal. Immediately after deflection, the kinetic energy of the ball is 47.70 J. What are the vertical and horizo..
On a cello, the string with the largest linear density (1.54 10-2 kg/m) is C string. This string produces a fundamental frequency of 63.4 Hz and has the length of 0.795 m between the two fixed ends. Find tension in the string.
What is the magnitude of the electric field at this point?
The effects of the spin of the earth
Calculate escape velocity for an object started at the surface of the earth, going straight up. Neglect any complications due to the earth turning.
An oil drop whose mass is determined to be 3.3x10^-15 is held at rest between two large plates separated by 1cm while the potential difference between them is 340 V. How numerous excess electrons does this have here.
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