2. Four cars are designed to protect passengers in a 16 m/s crash. The characteristics of the cars are shown below. Which car is most likely to do the best job of protecting the passengers inside?
Car 1
Characteristic
Car mass
Crumple zone length
1,450 kg
110 cm
Car 2
950 kg
50 cm
Car 3
2,000 kg
85 cm
Car 4
1,450 kg
120 cm
200 KN
1,000 KN
50 KN
1,000 KN
4,000 KN
200 KN
2,000 KN
1,000 KN
Crumple zone rigidity
Safety cell rigidity
Seat belt stiffness
Airbag rigidity
20 kN/m
None
11 kN/m
14 kN/m
10 KN
10 KN
None
45 KN
O A Car 1
O B. Car 2
O C Car 3
O D. Car 4

Follow these directions and answer the questions. 1. set up the ripple tank as in previous investigations. 2. bend the rubber tube to form a "concave mirror" and place in the ripple tank. the water level must be below the top of the hose. 3. generate a few straight pulses with the dowel and observe the reflected waves. do the waves focus (come together) upon reflection? can you locate the place where the waves meet? 4. touch the water surface where the waves converged. what happens to the reflected wave? 5. move your finger twice that distance from the hose (2f = c of c, center of the curvature) and touch the water again. does the image (the reflected wave) appear in the same location (c of c)? you may have to experiment before you find the exact location. sometimes it is hard to visualize with the ripple tank because the waves move so quickly. likewise, it is impossible to "see" light waves because they have such small wavelengths and move at the speed of light. however, both are examples of transverse waves and behave in the same way when a parallel wave fronts hit a curved surface.

The pressure increases by 1.0 x 104 n/m^2 for every meter of depth beneath the surface of the ocean. at what depth does the volume of a pyrex (bulk modulus 2.6 x 1010n/m^2) glass cube, 9.8 x 10^−2m on an edge at the ocean's surface, decrease by 7.5 x 10−10m^3? explain the formula beyond this point: p=1.0x10^4, b=2.6x10^10, l=9.8x10^−2, delta v=7.5x10^−10. at some point l needs to be cubed. why p is divided by delta v?

Work out sian speed for the first 30 minutes of her journey. give your answer in km/h.