Answer to Question #247079 in Physics for Mia

Question

1. Explain interms of impulse how padding reduces forces in a collision State this interms of a real example, such as the advantages of a carpeted vs. tile floor for a day care center.

2. Since astronauts in orbit are apparently weightless, a clever method of measuring their masses is needed to monitor their mass gains or losses to adjust diets. One way to do this is to exert a known force on an astronauts and measure the acceleration produced. Suppose a net external force of 50.0 N is exerted and the astronaut's acceleration measured to be 0.893 m/s, (a) calculate her mass with solution. (b) by exerting a force on the astronaut, the vehicle in which they orbit experiences an equal and opposite force. Discuss how this would affect the measurement of the astronaut's acceleration. Proposed a method in which recoil of the vehicle is avoided. Write your answers to the space provided below.

Answer 1

1. The impulse is

$$I=F/t.$$

Assume the padding is 7 mm thick. Compared to no carpet, the time it takes for the patient to fall is increased because the patients must cover additional 7 mm of a certain resistive force caused by the material of the padding. The force IFI of gravity is the same, the time increased, the impulse reduced according to the equation.

2. (a) By Newton's second law:

$$m=F/a=56\text {kg}.$$

(b) The method suggested in the condition reduces the acceleration of the astronaut. A method that does not reduce the acceleration must imply no connection to the vehicle of the body. We gan give the astronaut a gun that launches a projectile of known mass and known velocity. The astronaut will experience backward motion. We can measure the speed of previously stationary astronaut's recoil and find the mass applying conservation of momentum.