Recent content by Ahmad786

Energy is needed to "drive" an ecosystem Energy is needed to "drive" an ecosystem. What is the fundamental source of that energy? A. Chemical Bonds B. Heat C. Organic Fuel D. Sunlight I am not sure about this question but I think the answer is D. Sunlight is this correct? And if so why ?

So the answer would be B. is this correct?

"What force does the cable exert to give it this acceleration?" is this asking for net force if it is could I use the equation Fnet=Ft+Fg and If I used this Would it look like this?: Fnet=Ft+Fg Fnet=(3500N/9.81m/s2)(1.00m/s2)+3500N so would the answer be D. 3857 N

20. According to Newton’s law of universal gravitation, the force of attraction between any two masses is related directly to the A. velocity of the two masses B. product of the two masses C. distance between the masses D. sum of the masses ( I wasnt sure for this question so I had to...

19. The acceleration due to gravity on the Moon is 1/6 of that on Earth. The weight of a 10 kg mass on the Moon is A. 98 N B. 60 N C. 16 N D. 1.7 N (For this question I divided 9.81 by 6 and the multiplyed this by 10) Is this the correct way to do it ?

18. An elevator that weighs 3.5 x 103 N is accelerated upward at 1.0 m/s2. What force does the cable exert to give it this acceleration? A. 357 N B. 0 N C. 3500 N D. 3857 N (For this quesion I was really confused and I guessed that the force of tension in the cable was what the cable...

17. Two masses are connected by a string and pulled along a frictionless surface by another string one is 5kg and the other is 10 kg to which a tension of 40.0 N is applied. The magnitude of the system’s acceleration is A. 8.0 m/s2 B. 20 m/s2 C. 13 m/s2 D. 2.7 m/s2 (For this question I...

16. A block of dry ice weighing 1960 N is lying on a walkway. The coeffi cient of friction of the walking surface is 0.125. With what force must you push or pull the block to move it? A. 1.57 x 104 N B. 1960 N C. 245 N D. 6.38 x 10-5 N (For this I multiplyed 1960N (which is the Fn or fg)...

14. According to Newton’s _____ law, an object with no net force acting on it remains at rest or in motion with a constant velocity. A. Third B. Fourth C. Second D. First (for this question I related it to the concept of Newtons first law) Is this correct

8. If the displacement of a car was 150 km [E] and the velocity was 50.0 km/h [E], what was the time of travel? A. 100 h [E] B. 3.0 h C. 100 h D. 3.0 h [E] (I divided 150 by 50) 9. The airport is 60.0 km away and you have 1.00 h to get there. If your speed for the first 40.0 minutes...

Homework Statement An object suspended from a spring with a spring constant of 2.56 N/m vibrates with a frequency of 0.148 Hz a. What is the mass of the object b. What is the acceleration of the object at a displacement of -0.120m from the equilibriam position Homework Equations a...

Thx I got it :smile:

so for my question it would be ma=T+mg and the ma is mv2/r so T=mv2/r -mg so (0.160kg)(3.26m/s)2/(0.7m) - (0.160kg)(-9.81m/s2) or do i use positive 9.81 for this example and do (0.160kg)(3.26m/s)2/(0.7m) - (0.160kg)(+9.81m/s2)

there are example problems for this but they are on the downswing of the string they use the equation that I am using but its supposed to be used differantly for the upswinng I am still very confused:shy:

fc is centripetal force and is given by centripetal force= mv2/r this question is supposed to be answered using T= mv2/r + mg but i am confused on how to execute it