074 SC 130 Physical science t2 midterm ☁ Name:

Arc of a sphere text layers space: distance (cm) space: distance (cm) Graph 1: path of a ball through air (coordinates in cm) (−100, 0) (0, 0) (100, 0) (0, 80) r r k

  1. Write the quadratic equation for the ball path shown on graph 1.
  2. ____________ What will be the height (the y value) for the ball at x = 50 cm?
  3. What form(s) of energy does the RipStik rider on the right below have that the rider on the left below does not have?
    RipStik rider RipStik rider
  4. ________________ A 127 gram rectangular slab of soap is 9.60 centimeters long, 5.80 centimeters wide, and 2.90 centimeters high. What is the density of the rectangular slab of soap in grams per cubic centimeter?
  5. ________________ Will a 127 gram rectangular slab of soap that is 9.60 centimeters long, 5.80 centimeters wide, and 2.90 centimeters high float OR sink in water?
  6. ___________________ Speedilynn walked 532 meters in nine minutes and 22 seconds. What was her speed in meters per second?
  7. ________________ Where g = 980 cm/s², what is the duration in seconds for a ball to fall from a height of 1960 cm?
  8. ____________________ Before a collision with a white marble, a 5.20 gram blue marble went a distance of 28.0 centimeters in 0.70 seconds. Then the blue marble hit a white marble sitting on a ruler "marble" track. After the collision the blue marble has a momentum p of 75 g cm/s. What is the momemtum p of the white marble after the collision?
  9. ____________________ Calculate the force required to bring a marble with a momentum p of 210 g cm/s to a stop in 0.5 seconds.
  10. ____________________ When all 67 kilograms of me falls off a RipStik, I accelerate towards the ground at 9.8 m/s² and then I hit the ground, exerting a force of 1400 Newtons on the ground. Calculate the counter-force that the ground exerts on me.
  11. ____________________ An elastic band stretches (displaces) a distance x of 5 cm when a 70 gram-force force f is applied. Calculate Hooke's constant k for the elastic.
  12. ____________________ Presume that the elastic band in the above problem is Hookean, that is, it is a linear elastic material. What will be the displacement x when a 210 gram-force force f is applied?
  13. ____________________ A piece of iron connects two styrofoam cups with the cold water cup starting at 30° C. A piece of aluminum connects two other styrofoam cups with the cold water cup starting at 27° C. For both pairs of cups water at 100° C is added to the hot water cup. The cold water cup for the iron heats up to 36° C. The cold water cup for the aluminum cup heats up to 35° C. Based on this data, which material is the better conductor of heat, iron or aluminum?
  14. A RipStik carrying a 32 kilogram rider accelerates from a speed of 1.6 m/s at 4.0 seconds to a speed of 2.0 m/s at 6.0 seconds. Calculate and write the acceleration of the RipStik and force required to generate that acceleration in the table.
time (s)velocity (m/s)acceleration (m/s²)Force (N)
4.01.6
6.02.0

Equations
[ BMI= m h² ] [ V = lwh ] [ m = ρV ] [ d = ѵt ] [ ѵ = at ] [ d = ½at² ] [ d = ½gt² ] [ a= Δѵ Δt ]
[ y = − ( k r2 ) x2 + k ] [ p = mѵ ] [ GPE = mgh ] [ KE = ½mѵ² ] [ F= Δp Δt ] [ F = ma ] [ F = −kx ]

The point after, separating the awesomely observant from those merely paying minimal attention: What is unusual in the RipStik image?