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Q1. A 1000kg experimental rocket sled at rest on level frictionless rails is loaded with 50kg of propellant. It exhausts the propellant in a 20 s "burn." The rocket moves at 150m/s after the burn. What average force is experienced by rocket during the burn?
Q2. On the sunlit surface of Venus, the atmospheric pressure is 9.0 × 10^6 Pa and the temperature is 740K. On the earth's surface the atmospheric pressure is 1.0 × 10^5 Pa, while the surface temperature can reach 320K. These data imply that Venus has a "thicker" atmosphere at its surface than does the earth that means that the number of molecules per unit volume (N/V) is greater on the surface of Venus than on the earth. Find out the ratio (N/V) Venus / (N/V) Earth.
The lows note emitted by stretched string has a frequency of 50Hz.how many outcome are possible between 40Hz and 170Hz.
An old trick to find out if a train is coming is to put your ear on the rails of the track. Why is this more effective than just listening for the sounds the train makes in air.
An object is lifted vertically 2m and held there. If the object weighs 30N, how much work was done in lifting it. Describe it briefly.
How would you describe why we have different atmospheric pressure on different level (height) of earth's atmosphere in molecular level (molecular behaviour and what causes such behaviour).
What is the Acceleration of an object moving on a circular track
How much energy is necessary to bring the system back
To demonstrate the tremendous acceleration of a top fuel drag racer, you attempt to run your car into the back of a dragster that is "burning out" at red light before the start of a race. (Burning out means spinning the tires at high speed to heat..
Two forces FA and FB are applied to an object whose mass is 5.43 kg. The larger force is FA. When both forces point due east, the object's acceleration has the magnitude of 1.40 m/s2. Though, as FA points due east and FB points due west, the accelera..
A stone is thrown upward with an initial speed of 20 m/s. What is its acceleration at the highest point of its trajectory?
The magnitude of q is chosen to make the potential difference between spheres 430 V, with the inner sphere at higher potential. Compute q.
What is an actual mechanical advantage of the system
When two tuning forks of 128 Hz and 149 Hz, respectively, are sounded simultaneously, how various beats per second are heard.
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