hit

  1. H

    velocity problem: when does a projectile hit the ground?

    The height (in meters) of a projectile shot vertically upward from a point 2 m above ground level with an initial velocity of 24.5 m/sec is h=2+24.5t-4.9t^2 after t seconds. When does it hit the ground? At what velocity? I know the answers are 5.08 sec and -25.3 m/sec, respectively. I...
  2. S

    How hard will they hit the water?

    I apologise in advance if this should be somewhere else, but here goes anyways. Me and a friend are making a film and at one point someone jumps off a bridge and onto a boat (but in the filming they will jump straight into the water). What I need to know is, will this hurt our actor? We hope to...
  3. P

    Solving: Time for an object to hit the ground

    So my exam is in 2 days and I am having so much trouble. I am a new member, thanks for taking the time to view this question. If an object is thrown downward at 26 m/s from the top of a building, 102m high, the equation relating to displacement (meters) and time (seconds) is: s = 1/2 gt^2 +...
  4. B

    Work out generic formula to deduce number of days to add to date to hit nearest Fri

    Hi, I am trying to work out a generic formula to deduce the number of days to add to any date to in turn deduce the date of the next Friday closest to that date, using the week day number. So the given constants are: Target week day number: 6 (Friday) Number of Days in week: 7 Date | Day |...
  5. J

    Simple probability question: Hit and miss cards

    This should be very easy, but I can't get the idea of counting this right: So I have a stack of 100 cards. 21 of those says "HIT" and 79 says "MISS". What are the odds to take 32 random cards and have 30 of those saying "MISS" and 2 saying "HIT"? The cards are not put back on the stack after...
  6. K

    at what pint wood a missile hit?

    hi look for some help with this plz i have 2 ship in space, one is movering at 175 m/s the over is movering 170m/s, there are 45 km betreen them. the faster one is at the back and fire a missile at the over one max flight time = 10.00s max velocity = 3750m/sec. what i wood like to no is wen...
  7. N

    Finding coordinates when light hit the surface

    Hi all, I am stuck with the following question. This is a question posted to me by my physicist friend Attached is the figure of a ellipse with a formula of . In other word, it has a horizontal radius of 1.5 units and vertical radius of 1 unit. Now, suppose I launch a light from the...
  8. N

    Finding the coordinates when light hit the ellipse

    Hi all, I am stuck with the following question. This is a question posted to me by my physicist friend Attached is the figure of a ellipse with a formula of y^2+(\frac{x}{1.5})^2=1. In other word, it has a horizontal radius of 1.5 units and vertical radius of 1 unit. Now, suppose I launch...
  9. R

    Hit Ratio Formula

    Hey guys :) I'm developing an online game and for a major part of that game i need a formula. The part of the game is where you attack other users. Each user has stats such as: Strength Accuracy Agility Defence Now what i'm struggling with is calculation a hit ratio formula, so if you...
  10. X

    time for ball to hit the ground

    I've tried this problem 4 times now and i keep getting the wrong answer. I thought it would be a simple quadratic equation problem but I'm just not getting it. A baseball is “popped” straight up by a batter. The height of the ball above the ground is given by the function , where t is time...
  11. M

    Finding the time it takes to hit the ground

    The question reads The ball is tossed up in the air from a tower 50m above the ground. If the ball has an inital velocity of 30m/s, how long will it take to hit the ground if a = -9.8m/s^2. Now ive got my velocity function v = -10t +30, my height function h = -5t^2 +30t + 50, how can I find...
  12. R

    find force when baseball is hit

    A baseball (m = 149 g) approaches a bat horizontally at a speed of 43.3 m/s (97 mi/h) and is hit straight back at a speed of 49.5 m/s (111 mi/h). If the ball is in contact with the bat for a time of 1.10 ms, what is the average force exerted on the ball by the bat? Neglect the weight of...