1A space probe may be carried by a rocket into outer space. What keeps the probe moving after the rocket no longer pushes it? 2.The smokestack of a stationary toy train consists of a vertical spring gun that shoots a steel ball a meter or so straight into the air—so straight that the ball always falls back into the smokestack. Suppose the train moves at constant speed along the straight track. Do you think the ball will still return to the smokestack if shot from the moving train? 3. Suppose that the three balls shown in Exercise 19 start simultaneously from the tops of the hills. Which one reaches the bottom first? Explain. 4) Which is greater, an acceleration from 25 km/h to 30 km/h or one from 96 km/h to 100 km/h if both occur during the same time? 5)Gravity on the surface of the moon is only 1/6 as strong as gravity on earth . what is the weight of 10-kg object on the Moon and on Earth? What is the mass on each? 6)A grocery bag can withstand 300N of force before it rips apart. How many kilograms of apples can it safely hold? 7)If you exert a horizontal of 200N to slide a crate across a factory floor at constant velocity. How much friction is exerted by the floor on the crate? Is the force of friction equal and opposite directed on your 200-N push? If the force of friction isn’t the reaction force to your push, what is? 8)If a Mack truck and Honda Civic have a head -on-collision, upon which vehicle is the impact force greater? Which vehicle experiences the greater deceleration? Explain your answers.
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A3. This question is about testing an electrical circuit. The diagram below shows an electrical circuit consisting of four identical resistors RA, RB, RC, and RD. The resistance of each resistor is 10 k?. (a) Commercial resistors sometimes fail in one of two ways. They can go "open-circuit" in which the resistance of the resistor becomes infinite or they can go "short-circuit in which the resistance becomes zero. In order to test the circuit a technician connects a high resistance voltmeter between the terminals X and Y and applies a potential difference of 6 V across the resistor RA. (i) What voltage will the voltmeter read if all the resistors are functioning normally? (ii) What would the voltmeter read if either resistor RB or RD were to short-circuit? (iii) If the electrician were to note a reading on the voltmeter that suggested either RB or RD had short-circuited how could he test which one of these had in fact short-circuited using only the voltmeter? (b) Identify a possible fault with the circuit that would produce a reading of 6 V on the voltmeter when it is connected between X and Y.
A pellet gun is fired straight downward from the edge of a cliff that is 27.3 m above the ground. The pellet strikes the ground with a speed of 36.7 m/s. How far above the cliff edge would the pellet have gone had the gun been fired straight upward?
a storage tank of negligible mass and 30m high is filled with gasoline. please calculate the following: the gauge pressure and absolute pressure at the bottom of the tank. the force that acts on a square access hatch at the bottom of the tank that measures 0.5m x 0.5m. given that tha tank is shaped light a right circular cylinder with a height of 30m and with a base radius of 10m. the tank is attached to a steel cable of neglible mass and immersed in water. calculate the tension in the cable before and after it is immersed in water.
