A precision-controlled submersible of mass m m\,m is being tested in a deep-water tank. It moves under the influence of two horizontal forces, F1\mathbf{F}_1F1 and F2\mathbf{F}_2F2.
It is given that
F1=(2.5i−14.8j) N \mathbf{F}_1 = (2.5\mathbf{i} - 14.8\mathbf{j}) \text{ N} F1=(2.5i−14.8j) N F2=(0.4ki+1.2kj) N \mathbf{F}_2 = (0.4k\mathbf{i} + 1.2k\mathbf{j}) \text{ N} F2=(0.4ki+1.2kj) Nwhere k k\,k is a constant.
The submersible experiences an acceleration of (1.5i+2j) m s−2(1.5\mathbf{i} + 2\mathbf{j}) \text{ m s}^{-2}(1.5i+2j) m s−2.
Determine the value of kkk.
106 exam-style questions on WJEC A Level Maths 4.9 Forces and Newton's laws (A-level only), covering 4.9.1 Forces and Newton's laws (A-level only), 4.9.2 Forces and Newton's laws (A-level only), 4.9.3 Forces and Newton's laws (A-level only), 4.9.4 Forces and Newton's laws (A-level only), and 4.9.5 Forces and Newton's laws (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.