Homework Help: physics

Posted by julia on Tuesday, October 9, 2012 at 9:09am.

A frictionless30degrees incline should provide an acceleration of 4.90m/s2 down the incline. A student with a stopwatch finds that an object, starting from rest, slides down a 15m very smooth incline in exactly 3s. Is the incline frictionless?

physics - Anonymous, Tuesday, October 9, 2012 at 10:01am
a = 2d/t^2 = 2*15/(3*3) = 3.333 m/s2
g sin30 = 9.8 * 0.5 = 4.9
3.33 < 4.9
====> therefore the incline is not frictionless.

Answer this Question

Related Questions

physics - A 2.67 kg block starts from rest at the top of a 27.6 incline and...
Physics - A 2.42kg block starts from rest at the top of a 22.9◦ ...
physics pre-ap - A(n) 1100 kg car is parked on a 4 incline. The ...
physics - Objects of masses m1 = 4.00 kg and m2 = 9.00 kg are connected by a ...
physics - A block of mass m = 2.00 kg is released from rest at h = 0.400 m from...
physics - A uniform solid sphere rolls down an incline. (a) What must be the ...
physics - A 3.00-kg block starts from rest at the top of a 27.5° incline and...
Physics - A 3.00-kg block starts from rest at the top of a 33.5° incline and...
Physics - A student decides to move a box of books into her dormitory room by ...
Physics - A block of mass m = 5.9 kg is pulled up a è = 21° incline ...

For Further Reading

First Name:
School Subject:
Answer: