Homework Statement
x = (0.15 mm) cos (210x-120t)
what type of wave is described by this equation?
Longitudinal, transverse, angular frequency or both transverse and longitudinal
Homework Equations
NA
The Attempt at a Solution
Theres really no calculation. I thinking its longitudinal because...
Thats kinda what im asking...
if the displacement were greater or smaller of the mass, would it change the frequency of oscillation? And if it does, how?
Homework Statement
Calculate pressure outside the box- ATM pressure is 101325 Pa, air moving outside the box is 45 m/s, air density is 1.3 kg/m^3
Homework Equations
P + 1/2(roe)(v)^2 = Patm
The Attempt at a Solution
P + 1/2 (1.3kg/m^3)(45m/s)^2 = 101325 Pa
P + 1316.25 Pa = 101325 Pa
P=...
Homework Statement
0.54 kg mass hang vertically from a spring with k= 75 Nm. If the mass is displaced 3 cm vertically and allowed to oscillate, what is the frequency of oscillation?
Homework Equations
T= 2(pi) ((sqrt)(m/K))
F= 1/T
The Attempt at a Solution
T= 2(pi) ((sqrt)(0.54/75))
=...
Homework Statement
Rocket engine expends 1150 kg of gas in 1 second, with a velocity of -4.50×10^4 m/s. Calculate the average force exerted on the rocket by the gas during that 1.0 second interval
Homework Equations
F= m(delat)v / (delta)t
The Attempt at a Solution
F= (1150kg)(-45000m/s) / 1...
Homework Statement
A 48 gram dart is shot vertically upwards from a catapult with a spring constant of 350 N/m. The catapult is initially stretched from the equilibrium point by 21 cm. What is the height above the starting point reached by the dart?
Homework Equations
KE=PE, rearranging to...
Homework Statement
a box is pushed horizontally across a floor with a force of 70 N to the right. There is a friction force also acting on the box in the opposite direction of 18 N. if the box is displaced 8 meters. what is the net work done on the box?
Homework Equations
W(net)= Fd cos...
ok so lets say i use energy. I have this equation
v(initial)^2 = 2(mu)(g)(delta r)
and i rearrange to find r
r= v(initial)^2 / 2(mu)(g)
I put all my numbers in and i get a different answer, 0.54 meters. what did i do wrong?
Homework Statement
How far will a box slide if its initial velocity is 1.5 m/s, kinetic friction is 0.15 and the object is 30 kg
Homework Equations
a= (kinetic friction)(acceleration due to gravity) and
V(final)^2 - V(initial)^2 = 2(a)(D)
The Attempt at a Solution
a= 0.15 x 9.81 m/s^2
=...
Homework Statement
Two forces are acting on an object and make a 130 degree angle between the two. One force is horizontal to the x axis and is 13N. The other is 9 N.
Calculate the net force on the object
Homework Equations
Not really equations, but I broke the one force into its x and y...
I'm stumped. Is it one of those other constant acceleration equations? Whenever I look at them, it always seems like I'm not looking at the right one because it has more variables than what I'm given in the question
Homework Statement
A speeding car has instantenous velocity of 1 m/s when a stopwatch reads 10 seconds. It has constant acceleration of 2 m/s^2.
What is the cars speed when it reaches the stopwatch reads 12 seconds.
Homework Equations
x= (Vinitial)(DeltaT) + 1/2(a09deltaT)^2
I think this is...