ch05-p036 - 36. We label the 40 kg skier m which is...

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mg F w sin . θ −= 0 This yields F w = 68 N (uphill). (b) Given our coordinate choice, we have a =| a |= 1.0 m/s 2 . Newton’s second law mg F ma w now leads to F w = 28 N (uphill). (c) Continuing with the forces as shown in our figure, the equation mg F ma w will lead to F w = – 12 N when | a | = 2.0 m/s 2 . This simply tells us that the wind is opposite to the direction shown in our sketch; in other words, 12 N w F = G downhill . 36. We label the 40 kg skier “
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