Pete slides a crate up a ramp with constant speed at an angle of 23.2 ◦ by exerting a 137 N force parallel to the ramp. How much work has been done against gravity when the crate is raised a vertical distance of 2.97 m? The coefficient of friction is 0.26. Answer in units of J.

The slope of a velocity time graph over any interval of time gives the during that interval

The first-order reaction a→2b+c has rate constant 0.538 s−1. if the initial concentration of a is 0.867 mol l−1, what is the half-life of the reaction in seconds? remember to use correct significant figures in your answer (round your answer to the nearest hundredth). do not include units in your response.

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