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When a 310-g piece of iron at 180 °C is placed in a 95-g aluminum calorimeter cup containing 250 g of liquid at 10°C, the final temperature is observed to be 36 °C. The value of specific heat for iron is 450 J/kg C°, and for aluminum is 900 J/kg-C ▾ Part A Determine the specific heat of the liquid. Express your answer using two significant figures. 17 ΑΣΦ ? C = Submit Request Answer J kg-Cº
Sun r = 1.5 x 1011 m 1 of 1 Earth Part A Estimate the total power radiated into space by the Sun, assuming it to be a perfect emitter at 6000 K. The Sun's radius is 7.0 × 108 m. Express your answer to two significant figures and include the appropriate units. HÅ Units Q/t= Value Submit Request Answer Part B From this, determine the power per unit area arriving at the Earth, 1.5 x 1011 m away (Figure 1). Express your answer to two significant figures and include the appropriate units. μA Ć ? P/A= Value Units Submit Request Answer
What is the angular momentum of a 2.9-kg uniform cylindrical grinding wheel of radius 28 cm when rotating at 1400 rpm ? Express your answer using three significant figures and include the appropriate units. μÅ ? www L= Value Units Submit Request Answer Part B How much torque is required to stop it in 7.0 s? Express your answer using three significant figures and include the appropriate units. μA www Value Units Submit Request Answer