Three forces act on an object. two of the forces are at an angle of 95◦ to each other and have magnitudes 35 n and 7 n. the third force is perpendicular to the plane of these two forces and has magnitude 9 n. calculate the magnitude of the force that would exactly counterbalance these three forces. round your answer to one decimal place.

We want to find such that the object needs is in equilibrium:

We're told that , , and . We also know the angle between and is 95º, which means

is perpendicular to both and , so .

If we take the dot product of with the sum of all four vectors, we get

We can do the same thing with and :

Finally, if we do this with , we get

54 kilometers per hour

step-by-step explanation:

according to rules:

1 km = 1000 meter

which means that 1 meter = 1/1000 km

1 hour = 3600 second [ as 1 hour = 60 min = 60 *60 seconds ]

which means that 1 second = 1/3600 hour

therefore, 1 kilometer/hour =

thus to convert 15 meter per second to kilometer per hour, we multiply 15 to 3.6 kilometer/hour.

15 meter/second=   which is the required answer.

70

step-by-step explanation: