Physics questions

7(2- i (la) Bicyclists in the Tour de France reach speeds of 37.8 miles per hour (mi/h) on flat sections of the road. What is the speed in kilometers per hour (km/h)? (Note that 1 mile = 1.61 km) H Submit Answer Tries 0/10 (1b) What is the speed in meters per second (m/s)? Submit Answer Tries 0/10 h- g (2) A certain corner of a room is selected as the origin of a rectangular coordinate system. If a fly is crawling on an adjacent wall at a point having coordinates (2.46, 1.38), where the units are meters, what is the distance of the y from the corner of the room? Submit Answer Tries 0/10 in (3) One gallon of paint (volume = 3.78E-3 m3) covers an area of 28.2 m2. What is the thickness of the paint on the wall? Submit Answer Tries 0/10 I! e um measures 39.0 m x 21.0 m x 14.0 m. The density of air is 1.20 kg/m3. What is the volume of the room in cubic feet (11:3)? (Note that 1 m = 3.28 ft) :] (4a) An auditori Submit Answer Tries 0/ 10 (4b) What is the mass of air in the room in pounds (lb)? (Note that 1 kg = 2.20 lb) Submit Answer Tries 0/10 7@ i (5) Two points in a rectangular coordinate system have the coordinates (4.88, 2.74) and (-2.62, 4.59), where the units are centimeters. Determine the distance between these points. Submit Answer Tries 0/10 9d (6) The corners Submit Answer Tries 0/10 of a square lie on a circle of diameter 0.43 m. Each side of the square has length L. Find L. it! i (7) The volume of liquid owing per second is called volume ow rate Q and has the dimensions of [LP/[11. The flow rate of liquid through a hypodermic needle during an injection can be estimated with the following equation: Q=( HR"(P2-P1))/(8n L) Q = 7rR"(P2 " P.) 811L The length and radius of the needle are L and R , respectively both of which have the dimension [L]. The pressures at opposite ends of the needle P2 and P1, both which have dimensions of [M]/([L][T]2). n represents the viscosity of the liquid and has dimensions of [M]/([L][T]). n stands for pi and, like the number 8 and the exponent n, has no dimensions. Using dimension analysis, determine the value of n in the expression for Q (Enter an integer with no units). Submit Answer Tries 0/10 e a (8) The average blood volume in the human body is about 6 L. A typical blood sample contains about 5,500,000 red blood cells per cubic millimetre (mm3). Estimate how many red blood cells you have in your body. (1 L = 10'3 m3, 1 m = 1000 mm). Enter only the exponent of your answer: e.g. if your answer is 1x10", enter only the integer n. SubmitAnswer Tries 0/10 71!! 6 (3a) Sphere 1 has surface area A1 and volume V1 and sphere 2 has surface area A2 and volume V2. If the radius of sphere 2 is 3.69 times the radius of sphere 1, what is the ratio of the areas AZ/A1? W Tries 0/10 (9b) What is the ratio of the volumes V2/V1? SubmitAnswer Tries 0/10 E a (10) A woman wishing to know the height of a mountain measures the angle of elevation of the mountaintop as 12.2. After walking 1.02 km closer to the mountain on level ground, she nds the angle to be 16.5". Find the height of the mountain. [:] Submit Answer Tries 0/10 '96 (11) One cubic meter (1.00 m3) of granite has a mass of 2.70E+3 kg, and 1.00 m3 of copper has a mass of 8.92E+3 kg. Find the radius of an granite sphere whose mass is the same as that of an copper sphere of radius 1.15 cm. Submit Answer Tries 0/10 $10 (TZ) A aerialist on a high platform holds on to a trapeze attached to a support by a 7.7 m cord. Just before he jumps off the platform, the cord makes an angle a of 41.3 with the vertical. He jumps, swings down, then back up, releasing the trapeze at the instant it is 0.68 m below its initial height. Calculate the angle 9 that the trapeze cord makes with the vertical at this instant. (Enter the units of degrees as "deg") Submit Answer Tries 0/10 (13) The magnitudes of four displacement vectors shown in the drawing are A = 17.9 m, B = 11.1 m, C = 12.2 m, and D = 27 m. Determine the magnitude for the resultant vector that occurs when these vectors are added together. Submit Answer Tries 0/10 +y B 20.0' +.x 35.0' 50.0 D Submit All