some old questions

[austorior]

im not sure if me or anyone else asked these questions before. If any of these have been answered then please just provide me with the link if possible. Thanks.

A projectile is launched at 140 mph directed 70 deg above the horizontal. It hits a target 5 sec later. How much higher was the target than the projectile launcher?
_____ft. (please provide the physics formulas too thanks!)

Three 25 inch diameter spheres are placed together on the floor and a fourth identical sphere is stacked on top to form a pyramid. What is the height of this stack of spheres? ____in

A person is cutting through a iron pipe with a hacksaw. When the blade breaks through to the inside of the pipe, what percent of the job is completed? The pipe has a 1.5 in OD and a 1.2 in ID. ____%

a roll of duct tape contains 45 yd of 2 in wide tape. The diameter of the roll is 5 in when full and 3 in when empty. What is its diameter after 30 yd of tape are used?

Bob needs to paint a house in 12 hr, but working alone takes 17 hrs. How long after starting the job should bob get chuck to help if chuck works at 80% of bob's pace?

A spherical balloon is being inflated at 40 [unparseable or potentially dangerous latex formula]. at what rate is the surface area changing when the diameter is 22 cm?

[88bobcat]

[88bobcat]

[88bobcat]

[AuSmith]

[88bobcat]

[88bobcat]

[88bobcat]

[88bobcat]

[AuSmith]

Here's another solution to the duct tape problem. Note the area of a circle is [unparseable or potentially dangerous latex formula]

Think of the roll of tape as an annulus (a circle with a circular concentric hole in it). At first the area is [unparseable or potentially dangerous latex formula]. We are using [unparseable or potentially dangerous latex formula] out of [unparseable or potentially dangerous latex formula] yards, which represents [unparseable or potentially dangerous latex formula] of the area. So, when we finish using the [unparseable or potentially dangerous latex formula] yards, the area should be [unparseable or potentially dangerous latex formula]. Add the hole area back in to get a whole circle (I feel like making a pun). [unparseable or potentially dangerous latex formula]. Solve for [unparseable or potentially dangerous latex formula] inches.