Astudent decides to move a box of books into her dormitory room by pulling on a rope attached to the box. she pulls with a force of 80.0 n at an angle of 25.0° above the horizontal. the box has a mass of 25.0 kg, and the coefficient of kinetic friction between box and floor is 0.300. (a) find the acceleration of the box. (b) the student now starts moving the box up a 10.0° incline, keeping her 80.0 n force directed at 25.0° above the line of the incline. if the coefficient of friction is unchanged, what is the new acceleration of the box?

The acceleration of the box when the student was it along the horizontal is 0.37 m/s².

The acceleration of the box when it was pulled up 10⁰ incline is -1.29 m/s².

The given parameters;

The normal force on the box is calculated as;

The frictional force on the box is calculated as;

The acceleration of the box is calculated as;

When the student starts pulling the box at 10.0° incline;

The normal force on the box is calculated as;

The frictional force on the box is;

The acceleration of the box is calculated as;

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Part a)

Part b)

Explanation:

Force applied by the student on the box is 80 N at an angle of 25 degree

so here two components of the force on the box is given as

now in vertical direction we can use force balance for the box to find the normal force on it

now kinetic friction on the box opposite to applied force due to rough floor is given as

now the net force on the box in forward direction is given as

now the acceleration of the box is given as

Part b)

when box is pulled up along the inclined surface of angle 10 degree

now the two components of the force will be same along the inclined and perpendicular to inclined plane

now force balance perpendicular to inclined plane is given as

now the friction force opposite to the motion on the box is given as

now the net pulling force along the inclined plane is given as

now the box will decelerate and it is given as

low freq = 100 mhz

low wavelength =101.7m

length = 3x10^8/freq

where are the vectors ?