physics
what is the refrevtion of waves? And what are the laws'of refraction? Also about phase change.
physics
1. What are the examples of supersonic waves? 2. What is match cone, match no? 3. Define echo? 4. What is the effect of frequency on the velocity of sound in a gas? 5. Mathematical expression of beats. ''based on wave motion''
Algebra
The number is 14 more then the number to the sum of 30
maths
i tried this way but answer not coming..... :/ ans is 0.25
maths
a circular ink-blot grows at a rate of 2 sq cm per second. find the rate at which the radius is increasing after (28/11)seconds.
Math
A 2.5 ton truck stops and a 1300 pound car slams the brakes and skids 26 feet and hits the truck at 40 mph pushing the truck a foots length. how fast was the 1300 pound car traveling?
history
how are longhouses and present day homes alike '
mathematics
A farmer buys a tracter for Rs 120000. he pays Rs 60000 cash and agrees to pay the balance in annual installments of Rs 5000 plus 12% interest on the unpaid amount. what will the tracter cost him?
Science
2. Contrast the metric units of distance, time, and speed. Describe the relationship between them.
physics
A 2100 car starts from rest at the top of a 5.0m long driveway that is sloped at 20 degrees with the horizontal. If an average friction force of 4000N impedes the motion find the speed of the car at the bottom of the driveway.
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