Please show work for how to get the right anser for the first two! Acceleration
ID: 1776558 • Letter: P
Question
Please show work for how to get the right anser for the first two!
Acceleration due to gravity g 9.8 m/s Universal gravitational constant, G 6.67 x 10t1 N.m2/kg Mass of Earth 5.98 x 1024 kg Radius of Earth 6.38 x 10' km (desegde.cl-2 tngfar.IS) (A) Attempt All questions- circle the right answer 1. The work done by a constant force making an angle of 63.9° with the horizontal and pulled a box through a distance 17.4 m horizontally is 65.0 J, the constant force is 8.50 N (B) 866 N (C) 49.8 N (D) 36.9 N (E) 113.1 N (F) None is correct 2. At 25.0 cents per kilowatt-hour, the cost (in dollars) of leaving a 500 W security light on for 5 days during the spring break is (0,Stwr20hs) (A) 62.50 (B) 625.00 (C) 1.80 15.00 (E) 3.02 (F) None is correct 3. Which of the following options (A -F) is correct? (i) The momentum of a system is constant or conserved in the absence of external forces. (ii) The sum of momentum before collision is equai to the sum of momentum after 018 collision when the system is isolated. (ii) The area under the force-time graph gives the impulse or change in momentum. (iv) A collision is said to be elastic if the colliding objects stick together and move together after collision. (v) A collision is elastic if the kinetic energy before collision is not equal to kinetic energy after collision. C) (ii) & (iii) (D) (v) only (i), (ii), & (iii) (A) All are correct (F) None is correct (iv) & (v)Explanation / Answer
1. W = F.d = F d cos(theta)
65 = (F) (17.4) cos63.9
F = 8.49 N
Ans(A)
2. Energy = Power x time
= (500 W) x (5 days)
= (0.500 kW ) (5 x 24 hrs)
= 60 kWh
cost = total energy used x energy cost
= 60 x 25 = 1500 cents
= 15 dollars
Ans(D)
3. Ans> i, ii, iii are correct.