A crane lifts a 425 kg steel beam vertically upward a distance of 95m How much work does the crane do on the beam if the beam accelerates upward at 1.8 m/s2? Neglect frictional forces
A) 4.0 × 105 J B) 3.2 × 105 J C) 4.7 × 105 J D) 2.7 × 105J
C
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What is the maximum length of steel cable that can hang vertically supported from one end of the cable?
The Young's modulus of this steel is 2.10 × 1011 N/m2, the tensile strength of this steel is 7.4 × 108 N/m2, and the density of this steel is 7.6 × 103 kg/m2. A) 9.93 km B) 4.22 km C) 456 m D) 1.75 km E) 24.8 km
An aluminum electric tea kettle with a mass of 500 g is heated with a 500-W heating coil
How long will it take to change the temperature of 1.0 kg of water from 18°C to 98°C in the tea kettle? The specific heat of aluminum is 900 J/kg ? K and that of water is 4186 J/kg ? K. A) 5.0 minutes B) 7.0 minutes C) 12 minutes D) 15 minutes E) 18 minutes
How do we know the total mass of the Milky Way Galaxy that is contained within the Sun's orbital path?
A) by counting the number of stars visible in this region of the galaxy B) by estimating the amount of gas and dust in between the stars C) by using the law of conservation of angular momentum to calculate the orbital speeds of nearby stars D) by applying Newton's version of Kepler's third law to the orbits of the Sun or other nearby stars around the center of the Galaxy
As a supersonic aircraft gains speed, the angle of its shock wave
A) narrows. B) widens. C) remains unchanged.