Effitol840
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I have 2 questions:
1) A freight train has a mass of 1.1\times 10^7 kg. If the locomotive can exert a constant pull of 7.8\times 10^5 N, how long does it take to increase the speed of the train from rest to 90 km/h?
I figured I could just use the formula F=ma to get the acceleration then I plugged that into v=at+v_0 to get the time. I came up with the answer of 1267.61. I might have a problem with units because a was m/s^2 and v was in km/h. If that's the case how do I go about converting m/s^2 to km/h or vice versa?
2) An elevator of mass m moving upward has two forces acting on it: the upward force of tension in the cable and the downward force due to gravity. Let the elevator have a mass of 1200 kg and an upward acceleration of 2.1 m/s^2. Find T.
With this one I just plugged it into the equation T=ma but I don't know if this is the correct equation. I got an answer of 2520N.
If anyone could help me with this please do.
1) A freight train has a mass of 1.1\times 10^7 kg. If the locomotive can exert a constant pull of 7.8\times 10^5 N, how long does it take to increase the speed of the train from rest to 90 km/h?
I figured I could just use the formula F=ma to get the acceleration then I plugged that into v=at+v_0 to get the time. I came up with the answer of 1267.61. I might have a problem with units because a was m/s^2 and v was in km/h. If that's the case how do I go about converting m/s^2 to km/h or vice versa?
2) An elevator of mass m moving upward has two forces acting on it: the upward force of tension in the cable and the downward force due to gravity. Let the elevator have a mass of 1200 kg and an upward acceleration of 2.1 m/s^2. Find T.
With this one I just plugged it into the equation T=ma but I don't know if this is the correct equation. I got an answer of 2520N.
If anyone could help me with this please do.