Acustodian is struggling to move a 100. kg desk on a dolly, using a rope. he is pulling on the rope at a 60. ◦ angle. (a) how much force will the custodian need to apply in order to cause the desk to accelerate horizontally at a rate of 1.0 m s 2 ? (b) you suggest that the custodian will have an easier time if he uses a longer rope, which will decrease the angle. if the longer rope results in an angle of 30. ◦ , much force will the custodian need to apply in order to cause the 100. kg desk to accelerate horizontally at 1.0 m s 2 ?