Recent content by BeckyStar678

Homework Statement Determine the rotation rate, in rev/s, required to give an astronaut a centripetal acc of 3g while in circular motion with radius 9.45 m. Homework Equations ac=v^2/r i did 3g=v^2/9.45 and got 1.76 then i used T=2pie(r)/v, put in T=2pie(9.45)/1.76 The...

am i doing this problem right? help please! Homework Statement a particle initially located at the origin has an acceleration of a=3 j m/s2 and an initial velocity of vi= 5 i m/s. find a.) the vector position and velocity of the particle at any time t and b.) the coordinates and speed of...

Homework Statement what type of motion is occurring when slope is zero? not zero? Homework Equations The Attempt at a Solution a.) constant motion or no motion b.) changing velocity

Homework Statement what type of motion is occurring when the slope of a distance vs time graph is 0? when slope is constant? when slope is changing? Homework Equations The Attempt at a Solution a.) there is no motion b.) there is constant mvt c.) change from mvt to non mvt.

Homework Statement an attacker at the base of a castle wall 3.65 m high throws a rock straight up with the speed 7.40 m/s at a height of 1.55 m above the ground. a.) will the rock reach the top of the wall? b.) if so, what is its speed at the top? if not, what initial speed must it have to...

Homework Statement at t=0, one toy car is set rolling on a straight track with initial position 15 cm, initial velocity -3.50 cm/s, and constant acceleration 2.40 cm/s2. at the same moment, another car is set rolling n an adjacent track with inital position 10 cm, an initial velocity of +5.50...

Homework Statement find the instantaneous velocity of the particle described in figure 1.1 at the following time a.) t=3.0 s. Homework Equations instantaneous velocity equals dx/dt in the graph, 3 seconds of time is equal to 8 meters. The Attempt at a Solution so would the...

okay, so by looking at it again i got a.) it increases and acceleration is + b.) it increases and acceleration - c.) it decreases and acceleration is - d.) it decreases and acceleration is + i changed the accelerations because isn't it that when the signs are the same, that means that...

Homework Statement a cart is pushed along a straight horizontal track a.) in a certain section of its motion, its original velocity is +3 m/s and it undergoes a change in velocity of +4 m/s. does it speed up or slow down in this section of motion? is its acceleration positive or negative...

i think it is relative to the surface of the slope

Homework Statement a snow-covered ski slope makes an angle of 35 degrees with the horizontal. when a ski jumper plummets onto the hill, a parcel of splashed snow projects to a maximum position of 5 m at 20 degrees from the vertical in the uphill direction. find the components of its maximum...

Homework Statement in a game of football, a player takes the ball from the line of scrimmage, runs backward a distance of 10 yards, and then runs sideways parallel to the line of scrimmage for 15 yards. at this point, he throws a forward pass 50 yards straight downfield perpendicular to the...

Homework Statement vector A has x and y components of -8.70 cm and 15 cm, respectively; vector B has x and y components of 13.2 cm and -6.60 cm, respectively. if A-B+3C=0, what are the components of C? Homework Equations The Attempt at a Solution i can't figure out how to do it

Homework Statement two vectors A and B have precisely equal magnitudes. For the magnitude of A +B to be larger than the magnitude of A-B by the factor n, what must be the angle between them?Homework Equations The Attempt at a Solution i don't understand this because a-b would equal 0. so...

Homework Statement a snow-covered ski slope makes an angle of 35 degrees with the horizontal. when a ski jumper plummets onto the hill, a parcel of splashed snow projects to a maximum position of 5 m at 20 degrees from the vertical in the uphill direction. find the components of its maximum...