math
brett is having a party .first guest arrived by himself,3 guests then arrive together,each successive group arrives with 2 more guests than the group that entered previously.How many guests will have arrived when the twentieth group enters the room? please explain, thanks
physics
Comic-book superheroes are sometimes able to punch holes through steel walls. (a) If the ultimate shear strength of steel is taken to be 3.00 x 10^9 Pa, what force is required to punch through a steel plate 1.90 cm thick? Assume the superhero's fist has cross-sectional are...
Physics -- please help
What about the second part of the answer? And where did you get the 4.9 from?
Physics -- please help
Brittany throws a slingshot pellet directly at a target that is far enough away to take 0.190 s to reach. How far below the target does the pellet hit? Enter m as unit. How high above the target should she aim? Enter m as unit.
Physics
A pendulum and a mass spring system are both undergoing simple harmonic motion on Earth (use g = 10 N/kg). It is observed that every time the pendulum goes back and forth, the spring has gone up and down 12 times. If the pendulum has a length of 4 meters and the mass is 100 g,...
1/90
What will be the next. Result of wining machine 85 20 34 65 90-78 18 83 27 17
Science
if the wood in the bowl contains only 1/16 of its original C-14, then its age is four half-lives of C-14.
physice
A deep-sea fisherman struggles to bring in a big salmon (see figure below). Find the force each hand must exert on the pole if the tension in the line is 155 N. Neglect the weight of the pole and assume that the force exerted by the left hand is directed along the horizontal. ...
physics
A weather vane initially at rest has a moment of inertia of 0.119 kg · m2 about its axis of rotation. A 48.0 g piece of clay is thrown at the vane and sticks to it at a point 21.0 cm from the axis. The initial velocity of the clay is 23.0 m/s, directed perpendicular to ...
Math
Writing in math Braden and bialy each bought a kazoo for $0.89.they each paid with a $1.00 bill. Explain two different ways to show their change.
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