Physics. PH2530
Exercise1.1
Gus Perez
1.-The turning radius of a car is 36 ft. What will be the distance in meters?
We got 1ft = 0.3048 m. So we solve it like,
Distance = 36 ft. x (0.3048 m. / 1 ft.) = 10.9728 m. is the answer.
2. What is the sum of 1370 cm, 1575 mm, and 8.63 m in meters? (Hint: Refer to section 1.9 in the textbook.).
We convert everything to meters. We know that 1m = 100 cm and 1cm = 10 mm. so we got,
1370 cm = 13.7 m and 1575mm = 1.575 m, so we add up the 3 values;
Distance = 13.7 + 1.575 + 8.63 = 23.905 m.
3. The cross-sectional area of a hole is 725 cm2. Given that the area of a circle is A = πr2, find the radius of the hole. (Hint: Use the problem-solving method described in section 2.3 of the textbook.).
When solving for the radius r, we get; r=A√π We got A=725 and π=3.1416. So the answer is r = 15.19cm.
4. If 4y = (3) / (x² + 2), what will be the value x? For this problem, we solve for x from the equation. x² + 2 = 3 / 4y x² = (3/4y) - 2 and the value for x is the square root of (3/4y) - 2; x=√[(34y)-2] 5. Milwaukee is 121 mi (air miles) due west of Grand Rapids. Maria drives 255 mi in 4.75 h from Grand Rapids to Milwaukee around Lake Michigan. Find:
Given d = 255 mi and t = 4.75 h.
a. Her average driving speed.
The average speed is v = d/t = 255mi / 4.75 h = 53.634 mi/h
b. Her average travel velocity. Her average velocity is 53.634 mi/h from Grand Rapids to Milwaukee around Lake Michigan.

6. A rock is thrown down with an initial speed of 10.0 m/s from a bridge in the water. It takes 2.75 s for the rock to hit the water.
Given vi = 10 m/s (initial velocity) and t = 2.75 s (traveling time).
Find the final speed vf and the high of the bridge d.
Solutions. Are the following ones;
a. Find the speed of the rock as it hits the water.
We got a = g = 9.8, t = 2.75 and initial speed of vi = 10 we find the speed (vf) like, vf = at + vi = (9.8 x