Question 1: Choose the correct answer from the options provided: 1) A body of weight 14 dyne was put on a smooth plane inclined to the horizontal by angle of measure \( \theta \) and kept equilibrium by a force in direction of greatest slope up it's magnitude is 7 dyne thea: \( m \). \( (\theta)=\ldots \) \( \begin{array}{llll}\text { a. } 60 & \text { b. } 45 & \text { c. } 30 & \text { d. } 75\end{array} \)

Numa estrada seca, um carro com pneus em bom estado pode frear com desaceleração de \( 5 \mathrm{~m} / \mathrm{s}^{2} \). Se o carro estiver a \( 20 \mathrm{~m} / \mathrm{s} \), a distância mínima percorrida até parar vale, aproximadamente, em metros, é de: a) 100 b) 80 c) 50 d) 40 e) 25

Which force operates at a distance of 1 m ? A. Mechanical B. Weak nuclear C. Strong nuclear

Which of the following best describes the magnetic field lines around an isolated, permanent bar magnet? A. The field lines go from the magnet's north pole into its south pole. B. The field points straight into the bar magnet along radial lines that extend to infinity. C. The field points out along radial lines from the bar magnet, extending straight out to infinity. D. The field lines go from the magnet's south pole into its north pole.

What kind of force do you use when you rub a balloon on your hair to make your hair stand on end? A. Magnetic B. Strong nuclear C. Electric D. Weak nucleart

A satellite with a mass of 150 kg fires its engines to increase velocity, thereby increasing the size of its orbit about Earth. As a result, it moves from a circular orbit of radius \( 7.5 \times 10^{6} \mathrm{~m} \) to an orbit of radius \( 7.7 \times 10^{6} \mathrm{~m} \). What is the approximate change in gravitational.force from Earth as a result of this change in the satellite's orbit? (Recall that Earth has a mass of \( 5.97 \times 10^{24} \mathrm{~kg} \) and \( G=6.67 \times 10^{-11} \mathrm{~N} \cdot \mathrm{~m}^{2} / \mathrm{kg}^{2} \).) A. -54 N B. -216 N C. -113 N D. -148 N