When two mutually exclusive projects are being compared, explain why the short-term project might be higher ranked under the NPV criterion if the

When two mutually exclusive projects are being compared, explain why the short-term project might be higher ranked under the NPV criterion if the cost of capital is high; whereas, the long-term project might be deemed better if the cost of capital is low. Would changes in the cost of capital ever cause a change in the IRR ranking of two such projects?