145.7 15. A block rests on a horizontal, frictionless surface. A string is attached to the block, and is pulled with a force of 45 N at an angle 0 above the horizontal. After the block is pulled through a distance of 1.5 m its speed is 2.6 m/s and 50 J of work has been done on it. a) What is the angle? f=YSN F= 45 N 1S b) What is the mass of the block? W = +-- 1.5 m
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- You are playing a game and you push a cart to give it in. speed. The cart starts at the bottom (zero) of a ramp and after reaching the top of the ramp, the cart travels across a horizontal track w/ friction. The mass of the cart is 44 x 10^-3 kg. The ramp is 56 cm high. The length is 70 cm. What can you infer of the intial speed in (m/s)A 9.50 kg block is at rest on a horizontal floor, and then you pull it with a cord that exerts a tension force of 12.0 N on the block at an angle of 24.0o above the horizontal. The coefficient of kinetic friction between the block and the floor is 0.055. What is the speed of the block 0.85 s after it starts moving? Nothing I do is working! I only have three more tries to get it right and what should be working is not.Your cat "Ms." (mass 7.00 kg) is trying to make it to the top of a frictionless ramp 2.00 m long and inclined upward at 30.0 ° above the horizontal. Since the poor cat can't get any traction on the ramp, you push her up the entire length of the ramp by exerting a constant 100 N force parallel to the Part A If Ms. takes a running start so that she is moving at 2.40 m/s at the bottom of the ramp, what is her speed when she reaches the top of the incline? Use the work-energy theorem. ramp. m/s
- A 325-g model boat facing east floats on a pond. The wind in its sail provides a force of 1.55 N that points 25° north of east. The force on its keel is 0.655 N pointing south. The drag force of the water on the boat is 0.750 N toward the west. If the boat starts from rest and heads east, what is its final speed vf after it travels for a distance of 3.85 m? Uf = m/sA 1520-N crate is to be held in place on a ramp that rises at 30.0° above the horizontal (see figure). The massless rope attached to the crate makes a 22.0° angle above the surface of the ramp. The coefficients of friction between the crate and the surface of the ramp are uk = 0.450 and ls = 0.650 The pulley has no appreciable mass or friction. What is the MAXIMUM weight w that can be used to hold this crate stationary on the ramp? w = ? 22.0° Crate Ramp 30.0°A 5.35kg block is pulled across a floor by a 23.71 N force. The coefficients of static and kinetic friction are 0.4 and 0.2. What is the speed of the block after 1.95 m?
- 15. Gotta stay boosted. A 1.50 [kg] box moves along a frictionless horizontal surface with an initial speed of 5.00 [m/s] going to the right. A constant 3.00 [N] force is then applied to the box at an angle 0 = 35.0° with respect to the displacement vector. What is its final speed after moving 2.00 [m]? A. 4.91 [m/s] B. 5.62 [m/s] C. 5.74 (m/s] D. 6.00 [m/s]4. A 70 Kg athlete leaps straight up into the air from a trampoline with an initial speed of 7.0 m/s. Take y = 0 to be the position the athlete leaves the trampoline and ignore air resistance. how shoqes di nwob edhW (1 912 a. What is the maximum height the athlete reaches? Step 1) Draw a picture and list the value of all variables at the athlete's starting position and ending position. .£q912 ni nolicups or otni gulą of been woy z9ulev ri telual 10 11J (S 9912 Step 2) Is energy conserved? Yes = write the conservation of energy equation. No write the equation for non- conserved work. 102 (E 9912 nobil yd snob how s Step 3) Plug in values to the equation from step 2 and solve for maximum height. srij 11 m 0.00 to trigisil s of brucny ont moit siqaq to llut 101 Serler abin Toravste srit gnol wor 1010 smit tot svioz uoy tel lliw tens potten b. Solve this problem with kinematic equations and confirm the answers are the same. 0.000,21 A (8 21 (1 q912 Aitnsbl (S q912 smils sris tol svio2 (8…A box with mass 5.00 kg starts sliding down a ramp (1.00 m long) which is inclined at an angle 30.0°as shown in Figure. Initially, the box was at rest and it experiences a frictional force of 8.00 N while sliding down until it reaches the bottom of the ramp. What is the speed (in m/s) of box at the bottom of the ramp? d. 30° O a. 2.61 Ob.2.53 OC. 2.68 d. 2.83
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