Astudent pulls on a 20 kg box with a force of 50 n at an angle 45 degrees relative to the horizontal. the box increases
speed at a rate of 1.5 m/s2. what is the approximate value of the friction force on the box?
50 n
35.4 n
30n
5.4n

Which accounts for an increase in the temperature of a gas that is kept a constant volume

Two loudspeakers, 5.5 m apart and facing each other, play identical sounds of the same frequency. you stand halfway between them, where there is a maximum of sound intensity. moving from this point toward one of the speakers, you encounter a minimum of sound intensity when you have moved 0.33 m . assume the speed of sound is 340 m/s.part a) what is the frequency of the sound? part b) if the frequency is then increased while you remain 0.21 m from the center, what is the first frequency for which that location will be a maximum of sound intensity? express your answer to two significant figures and include the appropriate units.

Which of the the following are examples of projectile motion of both projectile motion and two dimensional motion