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A 23 {rm kg} kg child goes down a straight slide inclined 38{rm ^circ} above horizontal. The child is acted on by his weight, the normal force from the slide, kinetic friction. How large is the normal force of the slide on the child?
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In chemical changes, new substances are formed. Do the atoms involved actually change? If not, what has changed? How would you help your students visualize this?
Question: Some plants disperse their seeds when the fruit splits and contracts, propelling the seeds through the air. The trajectory of these seeds can be determined with a high-speed camera. In an experiment on one type ...
Question: A parallel-plate capacitor is formed from two 1.5 cm -diameter electrodes spaced 2.1 mm apart. The electric field strength inside the capacitor is 1.0 Ã-10 6 N/C. What is the charge (in nC) on each electrode? ...
Question: A sump pump is draining a flooded basement at the rate of 0.500 L/s, with an output pressure of 3.00 ✕ 105 N/m2. Neglect frictional losses in both parts of this problem. (a) The water enters a hose with a 3.0 ...
Question: Ten days after it was launched toward Mars in December 1998, the Mars Climate Orbiter spacecraft (mass 629 kg) was 2.87x10^6 km from the earth and traveling at 1.20x10^4 km/hr relative to the earth. At this tim ...
Question: A rocket starts from rest and moves upward from the surface of the earth. For the first 10s of its motion, the vertical acceleration of the rocket is given by ay=(3.00m/s3)t, where the +y-direction is upward. W ...
A 0.0260 kg bullet moving horizontally at 400 m/s embeds itself into an initially stationary 0.500 kg block. What is their velocity just after the collision? The bullet-embedded block slides 8.0 m on a horizontal surface ...
Question: PART A: How long (in ns) does it take light to travel 0.800m in vaccum? Express your answer in the appropriate units PART B: What distance does light travel in water during the time that it travels 0.800m in va ...
What are (a) the x component, (b) the y component, and (c) the z component of if r=a-b+c if a =8.0i+6.0j-3.3k, b=-5.5i+4.5j +6.0k and c=1.1i+5.6j+6.3k. (d) Calculate the angle between and the positive z ...
Question: Red light of wavelength 633 nm from a helium-neon laser passes through a slit 0.400 mm wide. The diffraction pattern is observed on a screen 3.45 m away. Define the width of a bright fringe as the distance betw ...
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